4FIQ:
reference: Crystal structure of pyridoxal biosynthesis lyase PdxS from Pyrococcus horikoshii., Matsuura A, Yoon JY, Yoon HJ, Lee HH, Suh SW, Mol Cells. 2012 Oct;34(4):407-12. doi: 10.1007/s10059-012-0198-8. Epub 2012 Oct, 18. PMID: 23104439

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