when intact scg was incubated in the presence of 32pi , phosphorylation of 90k protein was stimulated by cyclic gmp , dibutyryl cyclic gmp , and 8-bromo-cyclic gmp ( 10 microm ) , whereas phosphorylation of 54k protein was not significantly stimulated by any of these substances .
C0018338
cyclic gmp
C0012055
dibutyryl cyclic gmp