as assessed both by cholera-toxin-catalysed adp-ribosylation and by immunoblotting with an anti-peptide antiserum raised against the c-terminal decapeptide of forms of gs alpha ( the alpha subunit of the stimulatory guanine nucleotide-binding protein ) , rat glioma c6 bu1 cells express two forms of gs alpha : a major 44 kda form and a much less prevalent 42 kda form .
C0887847
alpha subunit
C0086903
gs