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Chemical structure of E. faecium peptidoglycan. The repeat unit on the right is stem-linked but has an uncross-linked pentapeptide stem; that is, the stem is a cross-link donor but is not a cross-link acceptor. The repeat unit on the left is stem-linked and cross-linked; that is, this stem is a cross-link acceptor but not a cross-link donor. The D-Asp bridge may be amidated.
