the addition of guanylylimidodiphosphate ( 0.1 mm ) , a nonhydrolyzable derivative of guanosine triphosphate ( gtp ) , to pmn membrane preparations reduced the fraction of high-affinity receptors detected in equilibrium binding studies from 21.3 +/- 0.13 to 11.8 +/- 0.05 % ( p less than 0.03 ) , without altering the binding affinities .
C0018366
guanylylimidodiphosphate
C0018353
guanosine triphosphate