Lysyl-pyridinoline (L-Pyr) cross-links are formed from two hydroxylysine residues and a lysine residue (LKNL plus a further hydroxyallysine contributed by HLKNL), found mostly in calcified tissues (Bailey et al. 1998).
Fu, JC, Uto, N, Siegel, RC, Horiuchi, K, Fujimoto, D
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