Fig. 4From: Identification of critical residues of O-antigen-modifying O-acetyltransferase B (OacB) of Shigella flexneriTopology model of OacB showing amino acids selected for site-directed mutagenesis. Topology model showing amino acids selected for mutagenesis. Red circles indicate amino acids critical for OacB whereas, black circles indicate non-critical residues. Grey coloured circle indicating residues showed slow agglutination reaction in slide agglutination test using serotype-specific antiseraBack to article page