Structural characterization of the membrane-associated regulatory subunit of type I cAMP-dependent protein kinase by mass spectrometry: identification of Ser81 as the in vivo phosphorylation site of RIalpha.
Boeshans KM, Resing KA, Hunt JB, Ahn NG, Shabb JB. Structural characterization of the membrane-associated regulatory subunit of type I cAMP-dependent protein kinase by mass spectrometry: identification of Ser81 as the in vivo phosphorylation site of RIalpha. Protein Sci. 1999 Jul; 8(7):1515-22.