these results suggest that a gtp or gtp gamma s requirement for peptide-mediated protein phosphorylation in spermatozoan membranes is mainly due to the enhanced formation of cyclic gmp , and it therefore is likely that peptide-induced elevations of cyclic nucleotide concentrations in spermatozoa are responsible for the specific increases in 32p associated with at least three sperm proteins , all apparently localized on the plasma membrane .
C0018353
gtp
C0079469
gtp gamma s