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Fig. 4. Distribution of the amino acids glycine, hydroxyproline and proline in hydrolysed byssal threads from Mytilus edulis ({square}) and M. galloprovincialis ({blacksquare}). Each point represents the mean of five hydrolysed samples taken at regular distances from the thread's attachment point to the stem. Values are means ±1 S.D. The 2 cm and 3 cm points represent the plaques from M. galloprovincialis and M. edulis, respectively.