1B0A:
reference: The crystal structure of a bacterial, bifunctional 5,10 methylene-tetrahydrofolate dehydrogenase/cyclohydrolase., Shen BW, Dyer DH, Huang JY, D'Ari L, Rabinowitz J, Stoddard BL, Protein Sci 1999 Jun;8(6):1342-9. PMID: 10386884

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