in contrast , the receptor-mediated elevation of intracellular cyclic amp levels by agents such as prostaglandin e1 ( in the presence of isobutylmethylxanthine ) or the addition of the cyclic amp derivatives ( dibutyryl cyclic amp ) markedly stimulated the activities of udp-galnac : gm3 , n-acetylgalactosaminyltransferase and udp-gal : gm2 , galactosyltransferase .
C0001455
cyclic amp
C0012054
dibutyryl cyclic amp