guanine nucleotides were present in the supernatant but could account for only a fraction of the total activity because the supernatant was able to cause greater stimulation than maximal concentrations of gtp and when specified concentrations of exogenous gtp were compared with equivalent nucleotide concentrations in the supernatant , the supernatant always led to greater activity .
C0018328
guanine nucleotides
C0018353
gtp