Novel isozymes of cAMP-dependent protein kinase exist in human cells due to formation of RI alpha-RI beta heterodimeric complexes - Tasken, K; Skalhegg, B S; Solberg, R; Andersson, K B; Taylor, S S; Lea, T; Blomhoff, H K; Jahnsen, T; Hansson, V (J Biol Chem, 1993)