3OTJ:
reference: X-ray and neutron protein crystallographic analysis of the trypsin-BPTI complex., Kawamura K, Yamada T, Kurihara K, Tamada T, Kuroki R, Tanaka I, Takahashi H, Niimura N, Acta Crystallogr D Biol Crystallogr. 2011 Feb;67(Pt 2):140-8. Epub 2011, Jan 15. PMID: 21245536

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