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Specificity of antiprogesterone-11α–bovine serum albumin (BSA) monoclonal Ab3 antibody (mAb3). The histogram shows binding to progesterone–BSA of 1A4 (black), 3B11 (light grey cross hatch) and DB3 (dark grey) in the presence of 100 µg/ml of BSA, progesterone-11α–BSA or free progesterone. 1A4.G2 and 3B11.B6 are individual clones of the mAbs used.
