Recent studies have revealed two types of ultraviolet fluorescence in collagen [I--3]. The first type with fluorescence parameters of 275 nm/3 15 nm is due to tyrosine residues; the nature of the compound responsible for the "long-wave" UV fluorescence (345 nm/440 nm) remains obscure [ 1, 21. The relationship between collagen cross-linking and longwave UV fluorescence have been considered by LaBeIIa and Thornhill [ 1 J . These authors showed

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