in serum-free medium ( dulbecco 's modified eagle 's medium ) , jeg-3 cells secreted hcg [ 27 +/- 3 ( +/- sem ) ng/mg cellular protein x 24 h ] and progesterone ( 22 +/- 2.5 ) , but neither c-19 nor c-18 steroids .
C1327616
secreted
C0007634
cellular