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Fig. 4. Effects of exposure to brackish water (10{per thousand}, control), seawater (30{per thousand}) or air (emersion) for 17 days on the glycine contents in the adductor muscle (white bars), foot muscle (grey bars), hepatopancreas (black bars) and mantle (hatched bars) of Polymesoda expansa. Values are means ± S.E.M. (N=4). aSignificantly different from the brackish water value (P<0.05); bsignificantly different from the seawater value (P<0.05).