N-Acetyl-
-D-glucosamine is the monomeric
unit of chitin. It is also
part of the peptidoglycan polymer of Gram-positive bacterial cell
walls. It is also a component of hyaluronic
acid in conjunction with glucuronic
acid.
N-Acetyl-
-D-glucosamine is also a component of the ABO blood group antigens
(Figure 9.29).