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The amount of hydroxyproline released from native pericardium (from three to six samples of each group) during incubation with collagenase III for 1, 2, 3, and 4 h. Data expressed as mean ± S.D., statistical significance (p≤0.05) is labelled above the column in comparison with the sample of the same number. Statistical analysis ANOVA (Student-Newman-Keuls method).
