Abstract

CD1 has been distinguished from conventional antigen-presenting molecules by its ability to present mycobacterial lipoglycans. Here, Rick Fairhurst and colleagues postulate that the hydrophobic groove of CD1 binds palmitic acid, displaying diverse, covalently-attached carbohydrates to T cells. Such T cells may constitute a previously unappreciated subset that helps B cells mount an antibody response to polysaccharide antigens.

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