1DU0:
reference: Exploring the role of glutamine 50 in the homeodomain-DNA interface: crystal structure of engrailed (Gln50 --> ala) complex at 2.0 A., Grant RA, Rould MA, Klemm JD, Pabo CO, Biochemistry 2000 Jul 18;39(28):8187-92. PMID: 10889025

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