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(A) Binding mode of putrescine (green carbon atoms) and of the methionine moiety (orange carbon atoms) of dcSAM in DsSPDS1 wild type, (B) SAM in DsPMT, (C) dcSAM in AtSPDS1 wild type, and (D) SAM in AtSPDS1 mutant with exchanges D131I, Q107T, V134T. For clarity, all non-polar hydrogen atoms are not displayed.
