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SAM clan phylogenetic tree. The three families are denoted by red (SAM-I), magenta (SAM-I/IV), and blue (SAM-IV) dashed lines. Colors are only given to terminal branches on the tree and distinguish sequences from each family, as well as differentiate with sequences that have lost the P4 helix in the SAM-I and SAM-I/IV families (green and cyan, respectively).
