4DH1:
reference: Low- and room-temperature X-ray structures of protein kinase A ternary complexes shed new light on its activity., Kovalevsky AY, Johnson H, Hanson BL, Waltman MJ, Fisher SZ, Taylor S, Langan P, Acta Crystallogr D Biol Crystallogr. 2012 Jul;68(Pt 7):854-60. doi:, 10.1107/S0907444912014886. Epub 2012 Jun 15. PMID: 22751671

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