reduction of binding of the agonist radioligand [ 125 ] iodo-n6- ( 4-hydroxyphenylisopropyl ) -adenosine with increasing concentrations of gtp and gpp ( nh ) p demonstrated that the guanine nucleotide affinity to the solubilized a1-receptor was more than 100-fold higher than to the membrane-bound receptor .
C0018353
gtp
C0018366
gpp ( nh ) p