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Distribution of charged amino acids in homologous sugar permeases. Sequence alignments are shown for E. coli (Ec) lactose (LacY), raffinose (RafB), and sucrose (CscB) permeases and for Klebsiella pneumoniae (Kp) and Citrobacter freundii (Cf ) lactose permeases. Positively or negatively charged amino acids are colored red or blue, respectively.
