( i ) together , these results are in line with the view that the action of proctolin on the ouabain-insensitive na+ efflux is the result of a temporary fall in internal pca and that its point of action is the ca2+ channel , where a putative g protein in the presence of gtp or gpp ( nh ) p is able to maintain constancy of the hormonal effect .
C0018353
gtp
C0018366
gpp ( nh ) p