Hydroxyallysine and hydroxylysine can react forming the Schiff base, which spontaneously undergoes an Amadori rearrangement resulting in the ketoimine cross-link hydroxylysino-5-ketonorleucine (HLKNL). This is much more stable than the aldimine crosslinks (Bailey et al. 1998).
Reiser, K, McCormick, RJ, Rucker, RB
Bailey, AJ, Lehto, M, Sims, TJ
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