4GUE:
reference: Identification of quercitrin as an inhibitor of the p90 S6 ribosomal kinase (RSK): structure of its complex with the N-terminal domain of RSK2 at 1.8 A resolution., Derewenda U, Artamonov M, Szukalska G, Utepbergenov D, Olekhnovich N, Parikh HI, Kellogg GE, Somlyo AV, Derewenda ZS, Acta Crystallogr D Biol Crystallogr. 2013 Feb;69(Pt 2):266-75. doi:, 10.1107/S0907444912045520. Epub 2013 Jan 19. PMID: 23385462

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