basal , naf- , gtp- , 5'-guanylimidodiphosphate ( gpp ( nh ) p ) - and forskolin-stimulated activities were similar in the three groups , implying that the stimulatory guanyl nucleotide regulatory binding site ( ns ) and the catalytical unit were unaffected by aging .
C0018353
gtp
C0018366
gpp ( nh ) p