a further enhancement of oxidase activity was observed with the addition of nonhydrolyzable gtp analogues , such as guanosine 5'-o- ( 3-thiotriphosphate ) ( gtp-gamma-s ) and guanosine 5'- ( beta , gamma-imidotriphosphate ) ( gmp-pnp ) , to the preincubation medium .
C0018353
gtp
C0018366
gmp-pnp