the ic50 ( concentration of drug required for 50 % inhibition ) of reifn-beta against 14 human cell lines was almost equivalent to that of ifn-beta , when the cells were cultured for 7 days and reifn-beta or ifn-beta was added on day 0 and exchanged every day from day 1 to day 6 .
C2917415
reifn-beta
C0015980
ifn-beta