in contrast , magnesium but not neomycin largely enhanced the potency of guanine nucleotides , particularly of gtp and its analog , guanosine-5'-o- ( 3-thiotriphosphate ) , to reduce fmet-leu-phe receptor binding , while maximal inhibition of agonist receptor binding by guanine nucleotides was identical with magnesium and neomycin .
C0018353
gtp
C0018328
guanine