3FCZ:
reference: Adaptive protein evolution grants organismal fitness by improving catalysis and flexibility., Tomatis PE, Fabiane SM, Simona F, Carloni P, Sutton BJ, Vila AJ, Proc Natl Acad Sci U S A. 2008 Dec 30;105(52):20605-10. Epub 2008 Dec 19. PMID: 19098096

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