using partially specific antisera combined with a 1 step celite microcolumn chromatography , progesterone ( p ) , 20alpha-hydroxypregn-4-ene-3-one ( 20alpha-p ) , 17-hydroxyprogesterone ( 17-p ) , and 16alpha-hydroxyprogesterone ( 16alpha-p ) could be measured in the same 1 ml aliquot of plasma .
C0033308
progesterone
C0012311
20alpha-hydroxypregn-4-ene-3-one