using a 'patch-clamp ' method in the 'inside-out ' configuration , atp , adp , amp-pcp and amp-pnp have been shown to increase the cgmp-dependent component of the rod plasma membrane conductance 2-4-fold and gtp , gdp but not gmp or nonhydrolyzable gtp analogs gmp-pnp and gtp-gamma-s to abolish the atp action .
C0018353
gtp
C0018366
gmp-pnp