plasma progesterone levels during the follicular and luteal phases were compared when measured simultaneously by competitive protein binding ( using guinea pig sera as binding agent ) and radioimmunoassay ( antiserum against progesterone-11-alpha-succinyl bovine serum albumin in rabbits ) , the values obtained were significantly different within each technique , depending on whether previous thin-layer chromatographic purification of the extracts was employed or not .
C0032105
plasma
C0229671
sera