Figure 3From: The Lactamase Engineering Database: a critical survey of TEM sequences in public databasesThe structure of TEM-1 β-lactamases (PDB entry 1BTL) with the positions of substitutions found in sequences from artificial sources. (PDB: 1BTL). Amino acid side chains are shown in stick representation: substitutions occurring at already described positions (green), substitutions at novel positions (red), and active site residues (yellow).Back to article page