Treatment with 1000 units/ml of marine beta-interferon enhanced an adenylate kinaselike activ-ity and markedly increased the level of L-alpha-phosphatidyl inositol 4-monophosphate in quiescent BALB/c-3T3 cells. The addition of platelet-derived growth factor (22 units/ml) or poly(I).poly(C) (0.3-1 microgram/ml) to the phosphorylation reaction mixture did not alter this interferon action.
