4WZI:
reference: Engineered stabilization and structural analysis of the autoinhibited conformation of PDE4., Cedervall P, Aulabaugh A, Geoghegan KF, McLellan TJ, Pandit J, Proc Natl Acad Sci U S A. 2015 Mar 24;112(12):E1414-22. doi:, 10.1073/pnas.1419906112. Epub 2015 Mar 9. PMID: 25775568

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