Figure 1.

Schematic representation of the Mtb cell envelope. Many of the classes of (glyco)lipids discussed in the text are represented schematically and are shown in probable locations in the cell envelope. Light blue symbols represent arabinose residues, red symbols represent galactose residues, brown symbols represent mannose residues, and black circles represent glucose residues. d-arabino-d-mannan, d-glucan, and d-mannan are capsular polysaccharides. Mycolic acid chains are shown in dark green. LM, lipomannan; ManLAM, mannose-capped lipoarabinomannan; AG, arabinogalactan; PG, peptidoglycan.