1A0A:
reference: Crystal structure of PHO4 bHLH domain-DNA complex: flanking base recognition., Shimizu T, Toumoto A, Ihara K, Shimizu M, Kyogoku Y, Ogawa N, Oshima Y, Hakoshima T, EMBO J 1997 Aug 1;16(15):4689-97. PMID: 9303313

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