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Weakly and non-complementing mutants in ZapA. The E. coli ZapA tetramer [18] is shown with two molecules in limon and two in green. The weakly complementing mutant amino acid residues (D32, T48, R46, E109) made in the present study are shown in cyan, the non-complementing residues (R13, E51, I56) are in red, and the complementing residues (N35 and Q39) in grey. Residue K42, which was cross-linked to FtsZ and which mutated versions were weakly complementing, is shown in blue.
