label: Group A carbohydrate
label_lc: group a carbohydrate
description: "A polysaccharide composed of a [3)-alpha-Rhap-(1->2)-alpha-Rhap-(1->]n rhamnose polysaccharide backbone with a beta-D-GlcpNAc side-chain modification on every alpha-1,2-linked rhamnose. A bacterial peptidoglycan-anchored surface rhamnose polysaccharide that is essential for growth of Streptococcus pyogenes and contributes to its ability to infect the human host."