long-term ( 48-hr ) incubations of either the fibroblast strain wi-38 or its sv40-transformed counterpart , wi-38-va13-2ra , in growth medium containing 1 micron prostaglandin e1 ( pge1 ) resulted in a sustained production and release of cyclic amp from the cells into the medium .
C0016030
fibroblast
C0007634
cells