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17β-estradiol (E2) concentrations are in the low pg/ml range in plasma. To develop a sensitive enzyme immunoassay (EIA) for E2-determination a highly specific antibody raised against a 6-carboxymethyl (CMO)-E2-bovine serum albumine conjugate was used. Based on 6-CMO-E2 and 6-amino-E2, four biotinylated tracers with two different spacer lengths between E2 and biotin were synthesized using biotinylation...
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