2PI6:
reference: Tryptophan as a three-way switch in regulating the function of the secretory signalling glycoprotein (SPS-40) from mammary glands: structure of SPS-40 complexed with 2-methylpentane-2,4-diol at 1.6 A resolution., Sharma P, Singh N, Sinha M, Sharma S, Perbandt M, Betzel C, Kaur P, Srinivasan A, Singh TP, Acta Crystallogr D Biol Crystallogr. 2009 Apr;65(Pt 4):375-8. Epub 2009, Mar 19. PMID: 19307719

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