4O0V:
reference: Back Pocket Flexibility Provides Group II p21-Activated Kinase (PAK) Selectivity for Type I 1/2 Kinase Inhibitors., Staben ST, Feng JA, Lyle K, Belvin M, Boggs J, Burch JD, Chua CC, Cui H, Dipasquale AG, Friedman LS, Heise C, Koeppen H, Kotey A, Mintzer R, Oh A, Roberts DA, Rouge L, Rudolph J, Tam C, Wang W, Xiao Y, Young A, Zhang Y, Hoeflich KP, J Med Chem. 2014 Feb 4. PMID: 24432870

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