4M6Y:
reference: Structure and mechanism of a nonhaem-iron SAM-dependent C-methyltransferase and its engineering to a hydratase and an O-methyltransferase., Zou XW, Liu YC, Hsu NS, Huang CJ, Lyu SY, Chan HC, Chang CY, Yeh HW, Lin KH, Wu CJ, Tsai MD, Li TL, Acta Crystallogr D Biol Crystallogr. 2014 Jun;70(Pt 6):1549-60. doi:, 10.1107/S1399004714005239. Epub 2014 May 23. PMID: 24914966

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