in contrast , tgf beta exerted both a stimulating and inhibitory effect on testosterone secretion : while hcg-stimulated testosterone secretion was enhanced by low doses of tgf beta ( 0.06-0.4 ng/ml , 48 h ) , it was decreased with higher concentrations of tgf beta ( 2.5-10 ng/ml , 48 h ) .
C0040690
tgf beta
C0079441
tgf beta