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The contents of total hyroxyproline (A), alkaline-soluble hyroxyproline (B), and alkaline-insoluble hyroxyproline (C) of Nile tilapia muscle tissue. The hyroxyproline values are means (n = 3), with their standard deviations (SDs) represented by vertical bars. Bar graphs of the same color, but with different letters are significantly different (p < 0.05).
