The Core of Consistent Diagnostics

Critical raw materials like antigens are the foundation of reliable, reproducible immunodiagnostic test systems. TRINA provides a wide variety of premium antigens, precisely crafted for ELISA, lateral flow diagnostics (LFD), and bead-based IVD and non-IVD applications – because accuracy starts with the right components.
Data sheets are available from TRINA.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z clear
CatNo Specifity Add
A0105 ACTH (1-39) human peptide
A0050 Adenovirus
A0103 Albumin, from placenta
A0104 Albumin recombinant
A0175 ALP
A0120-2 alpha-1-Acid glycoprotein
A0120-1 alpha-1-Acid glycoprotein (AGP)
A0121 alpha-1-Antichymotrypsin (ACT)
A0122 alpha-1-Antitrypsin
A0160 alpha-1-Microglobulin
A0160-2 alpha-1-Microglobulin
A0161 alpha-2-Macroglobulin
A0170 alpha-Amylase
A0171 alpha-Amylase
A0140 alpha-Feto Protein (AFP) antigen
A0140-1 alpha-Feto Protein (AFP) antigen
A0140-2 alpha-Feto Protein (AFP) antigen
A0140-3 alpha-Feto Protein (AFP) antigen
M0405 anti-15K allergen of the House Dust Mite Dermatop
M0525 anti-17D-Estradiol monoclonal
M0132 anti-ACTH monoclonal
P0526 anti-beta Estradiol
P0222 anti-biotin affinity purified
P0220 anti-biotin IgG fraction
M0370 anti-CMV IEA monoclonal
M0331 anti-Cortisol monoclonal
M0360 anti-Cytokeratins (1-19) monoclonal
M0410 anti-Diphteria toxin A subunit monoclonal
M0409 anti-Diphteria toxin monoclonal
M0515 anti-Epstein Barr Virus monoclonal
P0524 anti-Estradiol E2
M0625 anti-F1 antigen Yersinia pestis monoclonal
M0660 anti-Filaggrin + Profilaggrin monoclonal
P0950 anti-goat IgG affinity pure
M0720 anti-Granular layer kreatinocytes(GL-S2) monoclona
M0871 anti-HBcAg
P0801 anti-HBsAg
P0804 anti-HBsAg
P0864 anti-HBsAg affinity pure
P0803 anti-HBsAg affinity purified
M0861 anti-HCV core monoclonal
M0840 anti-Helicobacter pylori monoclonal
M0860 anti-Histones monoclonal
M2213 anti-HIV p24 monoclonal antibody
M0850 anti-HSV monoclonal
M0130 anti-human ACE monoclonal
P0123 anti-human Albumin
P0120 anti-human Alpha-1-acid Glycoprotein
P0117 anti-human Alpha fetoprotein,
P0116 anti-human Alpha fetoprotein IgG fraction
M0116 anti-human Alpha fetoprotein monoclonal
M0618 anti-human alpha FSH monoclonal
M0314 anti-human alpha hCG monoclonal
P0314 anti-human alpha hCG polyclonal
M1108 anti-human alpha LH monoclonal
M1990 anti-human alpha Tumor Necrosis Factor mab
M0131 anti-human AMP monoclonal
P0122 anti-human Apolipoprotein A-1
P0124 anti-human Apolipoprotein B
P0125 anti-human Apolipoprotein C-3
P0126 anti-human Apolipoprotein E
P0215 anti-human beta-2-microglobulin
P0212 anti-human beta-2-microglobulin affinity purified
P0213 anti-human beta-2-microglobulin IgG fraction
P0216 anti-human beta-2-microglobulin IgG fraction
M0212 anti-human beta-2-microglobulin monoclonal
M0619 anti-human beta FSH monoclonal
P0315 anti-human beta hCG affinity purified
P0316 anti-human beta hCG affinity purified
M0315 anti-human beta hCG monoclonal
M1109 anti-human beta LH monoclonal
P1912 anti-human beta-TSH, affinity pure
DM1073 Anti-Human-Blood-Type Antibodies
M0241 anti-human BUP monoclonal
M0240 anti-human BZO monoclonal
P0305 anti-human CEA
M0305 anti-human CEA monoclonal
P0311 anti-human CK-BB affinity purified
M0310 anti-human CK-MB monoclonal
P0312 anti-human CK-MM
M0381 anti-human COC monoclonal
P0320 anti-human Complement 3
P0321 anti-human Complement 4
M0330 anti-human Corticoliberin
P0391 anti-human C-Peptide
M0372 anti-human C-Peptide monoclonal
P0317 anti-human CRP
P0319 anti-human CRP IgG fraction
M0317 anti-human CRP monoclonal
M0318 anti-Human CRP polyclonal
P0390 anti-human Cystatin C
M0371 anti-human Cystatin C monoclonal
M0540 anti-human EDDP monoclonal
P0650 anti-human Ferritin affinity purified
P0651 anti-human Ferritin affinity purified
M0671 anti-human Ferritin monoclonal
M1002 anti-human free Kappa light chains monoclonal
M1102 anti-human free Lambda light chains monoclonal
P0709 anti-human GI antigen affinity purified
P0710 anti-human GI antigen affinity purified
P0711 anti-human GI antigen IgG fraction
M0725 anti-human Growth Hormone monoclonal
M0800 anti-human HAV monoclonal
M0865 anti-human HbA1c monoclonal
M0859 anti-Human HbA1c monoclonal
M0804 anti-human HBcAg monoclonal
M0802 anti-human HBsAg monoclonal
P0313 anti-human hCG
M0313 anti-human hCG intact monoclonal
M0820 anti-human HCV monoclonal
M0841 anti-human HE4 monoclonal
P0861 anti-human Hemoglobin
P0862 anti-human Hemoglobin
P0863 anti-human Hemoglobin
P0862-1 anti-human Hemoglobin Affinity pure
M0866 anti-human Hemoglobin monoclonal
P0865 anti-human HIV 1
P0866 anti-human HIV 2
M0830 anti-human HIV monoclonal
M0867 anti-human HSV IgM monoclonal
P0901 anti-human IgA
M0901 anti-human IgA monoclonal
P0903 anti-human IgD
P0905 anti-human IgE
M0905 anti-human IgE,monoclonal
P0907 anti-human IgG
P0915 anti-human IgG
P0906 anti-human IgG (Fc specific)
P0911 anti-human IgM
P0912 anti-human IgM
P0913 anti-human IgM affinity purified
M0911 anti-human IgM monoclonal
P0911-GF anti-human IgM (mu chain specific) IgG fraction
P0940 anti-human Insulin
M0930 anti-human Insulin monoclonal
M0940 anti-human Interferon,monoclonal
M0945 anti-human Interleukin 1-beta, monoclonal
M0946 anti-human Interleukin 2 receptor
P1001 anti-human Kappa light chain
M1001 anti-human Kappa light chains monoclonal
M1020 anti-human Ketamine monoclonal
M1100 anti-human Lactoferrin monoclonal
P1101 anti-human Lambda light chain
M1101 anti-human Lambda light chains monoclonal
M1107 anti-human LH, monoclonal
P1126 anti-human LP (a)
M1210 anti-human Malaria
M1201 anti-human Mannan Binding Protein monoclonal
M1260 anti-human MET monoclonal
M1261 anti-human MOP monoclonal
P1217 anti-human Myeloperoxidase antibody
P1217-G anti-human Myeloperoxidase antibody IgG fraction
P1223 anti-human Myoglobin
P1225 anti-human Myoglobin
P1224 anti-human Myoglobin IgG fraction
M1223 anti-human Myoglobin monoclonal
M1223-1 anti-human Myoglobin monoclonal
P1250 anti-human Myosin affinity purified
M1250 anti-human Myosin,monoclonal
P1304 anti-human Neuron Specific Enolase
P1305 anti-human Neuron Specific Enolase
M1304 anti-human Neuron Specific Enolase monoclonal
M1570 anti-human NT-proBNP
M1450 anti-human OPI monoclonal
P1421 anti-human OvCan antigen affinity purified
P1420 anti-human OvCan antigen IgG fraction
M1451 anti-human OXY,monoclonal
M1571 anti-human PAPP-A monoclonal
M1581 anti-human PCP monoclonal
M1565 anti-human Pepsinogen I
M1566 anti-human Pepsinogen II
M1510 anti-human Plasminogen Activator Inhibitor-1 mono
P1512 anti-human Plasminogen IgG fraction
M1511 anti-human Plasminogen monoclonal
M1580 anti-human PPX monoclonal
P1520 anti-human Prealbumin
M1520 anti-human Pregnancy, Specific beta-1-Glycoprotein
M1551 anti-human, Procalcitonin monoclonal
P1530 anti-human Progesterone
M1530 anti-human Progesterone monoclona
M1531 anti-human ProGRP monoclonal
M1545 anti-human Proinsulin monoclonal
M1550 anti-human Prolactin monoclonal
P1555 anti-human Prostaglandin E2
P1561 anti-human PSA
P1560 anti-human PSA affinity purified
P1562 anti-human PSA IgG fraction
M1563 anti-human PSA monoclonal
M1802 anti-human S-100 Protein monoclonal
M1851 anti-human ST2
P1851 anti-human ST2 affinity purified
M1830 anti-human syphilis monoclonal
M1992 anti-human THC monoclonal
M1915 anti-human Thyroglobulin monoclonal
M1920 anti-human Thyroxid peroxidase monoclonal
P1914 anti-human Thyroxine (T4)
P1953 anti-human Thyroxine (T4)
M1914 anti-human Thyroxine (T4) monoclonal
M1925 anti-human Tissue plasminogen activator mab
M0531 anti-human to E.histolytica
M1993 anti-human TRA monoclonal
P1930 anti-human Transferrin
M1930 anti-human Transferrin monoclonal
M1931 anti-human Transferrin Receptor monoclonal
P1950 anti-human Triiodothyronine (T3)
P1951 anti-human Triiodothyronine (T3)
M1950 anti-human Triiodothyronine (T3),monoclonal
M1970 anti-human Troponin I cardiac monoclonal
M1971 anti-human Troponin I skeletal muscle mab
P1980 anti-human Troponin T, affinity purified
M1980 anti-human Troponin T cardiac monoclonal
P1911 anti-human TSH
M1910 anti-human TSH monoclonal
P1985 anti-human Tuberculosis
M1991 anti-human Urokinase monoclonal
P0870 anti-Human Whole Serum
M0935-1 anti-IGFBP-1,monoclonal
M0920 anti-Influenza A (haemagglutinin) monoclonal
M0921 anti-Influenza A (nucleoproteid) monoclonal
M0922 anti-Influenza B monoclonal
M1010 anti-Keratinocyte membrane monoclonal
M1105 anti-legionella pneumonophila
M1124 anti-LPS Francesella tularensis monoclonal
M1021 anti-Methadone Mab
P0908 anti-mouse IgG
A0106 Anti-Müllerian Hormone (AMH)
M1568 anti-PIVKA II
M1701 anti-Rabies monoclonal
M0931 anti-rat Insulin/proinsulin monoclonal
P1910 anti-recombinant TSH, affinity pure
M0805 anti-rHBeAg monoclonal
M0803 anti-rHBsAg (ayw subtype) monoclonal
M1714 anti-Rotavirus group specific antigen monoclonal
M1715 anti-RSV monoclonal
M1801 anti-Salmonella typhimurium monoclonal
M1805 anti-Sex Hormone Binding Globulin monoclonal
M1850 anti-Streptavidin monoclonal
M1904 anti-Testosterone monoclonal
M1928 anti-Toxoplasma gondii, monoclonal
M1940 anti-Treponema Pallidum monoclonal
M1945 anti-Trichomonas vaginalis monoclonal
P1954 anti-Troponin I
M2209 anti-Verotoxin 1 monoclonal
M2210 anti-Verotoxin 2 monoclonal
A0181 Apolipoprotein
DM1125-S Bartonella henselae IgM
A0218 beta-2-Glycoprotein 1
A0205-1 beta-2-Microglobulin
A0205-2 beta-2-Microglobulin
A0326 beta Chorionic Gonadotrophin (hCG)
A0327 beta Chorionic Gonadotrophin (hCG)
A0210 beta-Glucuronidase/Arylsulfatase
A0220-1 Breast tumor CA 15-3
A0220-2 Breast tumor CA 15-3
A0220-3 Breast tumor CA 15-3
M0230 Breast Tumor (CA15-3) monoclonal
A0715-1 CA 19-9
A0710 CA 19-9 antigen
A0710-1 CA 19-9 antigen Gastro intestinal (GI)
A0710-2 CA 19-9 antigen Gastro intestinal (GI)
A0710-3 CA 19-9 antigen Gastro intestinal (GI)
A0715-2 CA 19-9 Gastro intestinal (GI)
M0361 CA19-9 monoclonal
M0362 CA 242 monoclonal
M0363 CA 724 monoclonal
A0301 Calmodulin
A0303 Calmodulin
A0304 Calprotectin
A0305 Cancer antigen CA 72-4
A0310-1 Cathepsin D
A0310-2 Cathepsin D
A0311 Cathepsin G
A0384 CCP antigen
A1954 CDT
A1955 CDT (Carbohydrate Deficient Transferrin)
A1956 CDT free Transferrin
A0315-1 CEA
A0315-2 CEA
A0316-1 CEA
A0318 Centromere B human
A0320 Ceruloplasmin
A0323 Cholesterol Concentrate
A0324 Cholinesterase
A0325 Chorionic Gonadotrophin (hCG)
A0335 Chylomicrons
A0348 CK-BB
A0350-1 CK-MB
A0350-2 CK-MB
A0355-1 CK-MM
A0355-2 CK-MM
A0356 CK-MM
A0397 CMV
M2212 CMV IgM monoclonal antibody
A0360 Cohn IV Paste
A0364 Collagen type IV
A0367 Complement C1q
A0365 Complement C3
A0366-1 Complement C4
A0366-2 Complement C4
A0375 Corticosteroid Binding Globulin
A0385-1 C Reactive Protein (CRP)
A0385-2 C Reactive Protein (CRP)
A0385-1L C Reactive Protein (CRP) Lyophilized
A0182 Crude Allergen Material Wheat 7352
A0396 Cyfra 21-1
A0390 Cystatin C
A0395-2 Cytokreatin 19 Antigen
A0405 D-Dimer
M0404 D-Dimer
A0412 Dengue
M0412 Dengue monoclonal
A0540 Elastase
A0530 Eosinophil Cationic Protein (ECP)
A0521 Epidermal Growth Factor, human
A0522 Epidermal Growth Factor, mouse
A0525 Epstein Barr Virus (EBV) Antigen
A0550 Factor V (Proaccelerin)
A0648 Factor Xa
A0652 Factor Xa Purified Antigen
A0651 Factor X Purified Antigen
A0600 Fatty Acid Binding Protein
A0601 Fentanyl
M0672 Fentanyl
A0605 Ferritin
A0606 Ferritin
A0607 Ferritin
A0608 Ferritin
A0609 Ferritin
A0615 Fibrin
A0616 Fibrin Degradation Product
A0630 Folate binding protein
A0640-1 Follicle-Stimulating Hormone
A0640-2 Follicle-Stimulating Hormone
A0641 Follicle-Stimulating Hormone
A1584 free Prostate Specific Antigen (fPSA)
M0670 free PSA Ab
A0741 Galectin-3
A0728 gamma Glutamyl Transpeptidase
M0709 Gastro Intestinal tumor monoclonal
A0722 Glial Fibrillary Acidic Protein
A0729 Glutamate Oxaloacetate Transaminase (GOT)
A0730 Glutamate pyruvate Transaminase (ALT)
A0737 GM1-Asialo
A0739 GMB
A0740 GMB
P0127 Goat anti-human Apolipoprotein C-3, affinity purified
P1001-GF Goat anti-human Kappa Light chain, IgG Fraction
P1756 Goat anti-Human RBP
P1757 Goat anti-Human RBP Serum
P1758 Goat anti-Human RBP Serum
A0929 Goat IgG
A0720 GP41, HIV peptide sequence
A0735 Growth Hormone
A0736 Growth Hormone (human)
A0805 Haptoglobin
A0815 HAV Antigen
A0824 HBsAg Antigen subtype AD
A0823 HBsAg Antigen subtype AY
PS7002 hCG positive urine from pregnant donors
A0893 HCV
A0845 HE4 antigen
A0894 Helicobacter pylori
A0894-R Helicobacter pylori recombinant antigen
A0894-Cag1 Helicobacter pylori recombinant antigen (CagA, Coating)
A0894-Cag2 Helicobacter pylori recombinant antigen (CagA, Conjugating)
A0808 Hemoglobin
A0809 Hemoglobin A1c
A0811 Hemoglobin A1c 10.0%
A0812 Hemoglobin A1c 15.0-16.0%
A0813 Hemoglobin A1c 3.0-4.0%
A0816 Hemoglobin A1c 6.5%
A0814 Hemoglobin A1c 8.0%
A0810 Hemoglobin base free of A1c
A0821 Hepatitis B “c” Antigen
A0841 Hepatitis B “s” Antigen subtype AD inactivated
A0842 Hepatitis B “s” Antigen subtype ADR inactivated
A0843 Hepatitis B “s” Antigen subtype ADW inactivated
A0834 Hepatitis B “s” Antigen subtype AY, crude pure
A0836 Hepatitis B “s” Antigen subtype AY inactivated
A0837 Hepatitis B “s” Antigen subtype AYR inactivated
A0838 Hepatitis B “s” Antigen subtype AYW inactivated
A0895 Hepatocyte Growth Factor (HGF)
A0897 Herpes Simplex Virus 1 Antigen
A0850 Herpes Simplex Virus 1 Glycoprotein G
A0898 Herpes Simplex Virus 2 Antigen
A0851 Herpes Simplex Virus 2 Glycoprotein G
A2046 Heterophilic Immunoglobulin Elimination Reagent
A0892 Hirudin recombinant
A0901 HIV-1 Mosaic GP36-1
A0902 HIV-1 Mosaic GP36-2
A0903 HIV-1 Peptide GP36-BSA
A0904 HIV-1 Recombinant Antigen
A0899 HIV-1 Recombinant Antigen (gp41)
A0900 HIV-2 Recombinant Antigen (gp36)
A0905 HIV-O Recombinant Antigen
A0896 HIV Recombinant Antigen
M2214 HSV 1/2 IgM monoclonal antibody
A0890 HTLV-I
A0891 HTLV-II
A0742 Human GPT protein, expressed in E.coli
A2048 human Metapneumovirus
A0650 Human Placental Factor XIII Purified Antigen
A0743 Human Prothrombin
A0101 Human Serum albumin
A0102 Human Serum albumin
A1285 Human Serum Amyloid P
A0914 IgA Kappa Myeloma
A0913 IgA Lambda Myeloma
A0916 IgA subclass 2
A0915 IgA total
A0919 IgE total
A0954 IGF1
A0932 IgG1 Kappa myeloma
A0926 IgG1 Lambda myeloma
A0920 IgG total
A0921 IgG total
A0934 IgM Kappa Myeloma
A0935 IgM Lambda Myeloma
A0927 IgM total
A0928 IgM whole Myeloma
A0215 Immunoglobulin G
M0907 Immunoglobulin G1 monoclonal
M0908 Immunoglobulin G2 monoclonal
M0909 Immunoglobulin G3 monoclonal
M0910 Immunoglobulin G4 monoclonal
A0924 Immunoglobulin Kappa
A0924-2 Immunoglobulin Kappa semi pure
A0924-1S Immunoglobulin Kappa supreme pure
A0925 Immunoglobulin Lambda
A0925-2 Immunoglobulin Lambda semi pure
A0925-1S Immunoglobulin Lambda supreme pure
A0931 Influenza B
A0951 Insulin like growth factor binding protein 1
A0953 Insulin like growth factor binding protein 3
A0958 Interleukin-2 Receptor
A0959 Interleukin-2 Receptor
A0960 Interleukin-3, human
A0961 Interleukin-4, human
A0744 irregular anti-erythrocytic antibody positive
A1014 Jo-1
A1101 La (SS-B) human
A1120 Lipase
A1121 Lipase
A1130 Lipoprotein a (Lp-a)
A1160-1 Luteinizing Hormone
A1160-2 Luteinizing Hormone
A1161 Luteinizing Hormone
A1165 Lysozyme
A1210 Malaria
A1200 Measles
A2047 Meconium
M1569 Mouse anti-Parvovirus B19 Monoclonal antibody
A0922 Mouse Immunoglobulin G
A1280 Mycoplasma pneumoniae
A1260 Myeloperoxidase (pANCA)
A1270 Myoglobin
A1275 Myosin light chain 1, ventricular
A1371 N-acetyl-beta-D-glucosaminidase (NAGU)
A1330 Nerve Growth Factor
A1340 Neuron Specific Enolase (NSE)
A1350 Neutrophil Elastase Grade 1
A1351 NGAL (Human Neutrophil Gelatinase Associated Lipocalin)
A1345 Non-neuronal Enolase (NNE)
A1370 NT-pro BNP
A1470 Osteocalcin
M0380 Ovarian (CA125) monoclonal
A1485 Ovarian Cancer Antigen CA-125
A1480-1 Ovarian Cancer CA-125
A1480-2 Ovarian Cancer CA-125
A1573 PAPP-A
A1574-REC PAPP-A recombinant
A1502 Parainfluenza 2
A1503 Parainfluenza 3
A1505 Parietal Cell Antigen
A0337 Peanut positive plasma
A1510 Pepsinogen I
A1515 Pepsinogen II
A1530 Placental Lactogen
A1539 Plasminogen
A1543 Platelet Factor IV
A1570 Prealbumin
A1520 Pregnancy-specific
A1601 Procalcitonin
A1581 Prolactin
A1580 Prolactin, recombinant
A1585-1 Prostata Specific Antigen (PSA)
A1585-2 Prostate Specific Antigen (PSA)
A1590-1 Prostatic Acid Phosphatase (PAP)
A1590-2 Prostatic Acid Phosphatase (PAP)
A1595 Proteinase 3 (cANCA)
A1591 Protein C
A1596 Protein S
A1597 Prothrombin
A1587 PSA
A1586 PSA-ACT Complex
A1587-S PSA serum
A0930 Purified Human Gamma Globulin High Pure (IgG>90%)
A1709 Renin human recombinant
A1730 Retinol Binding Protein
A1735 RF purified
A1741 RNP 70
A1740 RNP-70kD, human
A1751 Rotavirus
A1750 RSV, Respiratory Syncytical Virus
A1750-B RSV, Respiratory Syncytical Virus Grade 2
A1761 Rubella high pure
M2211 Rubella IgM monoclonal antibody
A1760 Rubella pure
M1803 SARS-COV-2 IgM antibody monoclonal
A1803 Scl-70
A1820 Serum Amyloid Amylase
A1821-1 Serum Amyloid Amylase
A1821-2 Serum Amyloid Amylase
A1825 Serum Amyloid Protein
A1830 Sex Hormone Binding Globulin
A1830-C Sex Hormone Binding Globulin recombinant antigen
A0923 Sheep Immunoglobulin G
A1813 Sm
A1812 Sm/RNP
A0994 Sodium Heparin Whole Blood
A1840 Somatostatin 1-28
A1815 SS-A (ro)-52 Antigen recombinant
A1816 SS-A (ro)-60 Antigen recombinant
A1814 SS-A (ro) Antigen
A1850 Streptavidin
A1860 Streptolysin O
A0450 T2 DIJODTHYRONIN
A1922 Thrombomodulin
A1925 Thyroglobulin
A1930 Thyroid Microsomal Antigen
A1932-1 Thyroid Stimulating Hormone
A1932-2 Thyroid Stimulating Hormone
A1935 Thyroxine Binding Globulin
A1940 Tissue Polypeptide Antigen (TPA)
A1975 Toxoplasma gondii lysate Antigen
M2215 Toxoplasma IgM monoclonal antibody
A1928-1 TPO Thyroid Peroxidase
A1928-2 TPO Thyroid Peroxidase
A1934 TPO Thyroid Peroxidase recombinant
A1950 Transferrin
A1950-S Transferrin
A1951 Transferrin Receptor
A1953 Transferrin Receptor
A1953-N1 Transferrin Receptor pure
A1970-1 Treponema Pallidum
A1970-2 Treponema Pallidum
A1972 Treponema Pallidum recombinant 15, 17 kDa
A1971 Treponema Pallidum recombinant 47 kDa
A1973 Treponema TmpA recombinant
A1957 Triglyceride
A1959 Troponin C
A1965 Troponin Complex Antigen
A1958 Troponin C recombinant
A1960 Troponin C subunit (skeletal)
A1961 Troponin I (cardiac)
A1963 Troponin I (cardiac)
A1962 Troponin I (skeletal)
A1964 Troponin T
M1972 TSHR (TSH Receptor)
A1977 Tuberculosis
A2045 Urinary Trypsin Inhibitor
A2040 Urine Protein 1