the amount of testosterone that is specifically bound was calculated using the formula : ( see article ) concentration , where `` '' ri '' '' is the ratio ( 14c ) testosterone : ( 3h ) epitestosterone in plasma prior to centrifugation , `` '' ru '' '' is the isotope ratio in the protein-free supernatant obtained after ultracentrifugation ( 149,000 x g , at 0 c , for 18 h ) and `` '' t concentration '' '' is the testosterone concentration in plasma resulting from addition of ( 14c ) testosterone , the endogenous steroids having been removed by preliminary charcoal extraction .
C0014594
) epitestostero
C0039601
( 14c ) testos