if anionic production of quantum bumps in limulus photoreceptors is mediated by changes in cyclic nucleotides , then the electrophysiological response of limulus photoreceptors to tungstate may indicate a role for phosphodiesterase rather than adenylate cyclase in mediating light-induced cyclic nucleotide alterations in this cell .
C0028631
cyclic nucleotides
C0028630
nucleotide