the activities of the two marker enzymes , 5'-nucleotidase and gamma-glutamyltranspeptidase displayed striking , and quite different , species-dependent differences , with no apparent relationship to phylogeny . alpha 1 and beta-adrenergic receptors were characterized in isolated liver plasma membranes by radioligand binding techniques .
C0034785
beta-adrenergic receptors
C0007603
plasma membranes