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Structures of Mtb lipoglycans. Mannose-capped lipoarabinomannan (ManLAM); the mannan moiety of ManLAM consists of ∼20–30 Manp residues and the arabinan polymers of ∼60 Araf units; the precise number of arabinan chain(s) attached to mannan is still uncertain. Lipomannan (LM) is devoid of the arabinan chains of ManLAM. R1, R2, R3, R4 are tuberculostearic acid, oleic acid, or palmitic acid.
