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High-pressure liquid chromatography: box-and-whisker plot results for 30 paired scar specimens expressed in picomoles of ε-(γ-glutamyl)lysine isopeptide bonds in digests. Kolmogorov-Smirnov test was not normally distributed but applied Mann-Whitney U test was significant (p < 0.05). 1,4 DAB, 1,4-diaminobutane; TGase, tissue transglutaminase.
