Fig. 7. Immunohistochemical detection of taurine transporter on the mantle of mussels exposed to changes in ambient salinity. (A,B) Mantle sections and (C,D) gill sections of mussels acclimated to 1x seawater (A,C) or exposed to 0.5x seawater for 48 h (B,D). The brownish color on the surface of the mantle (indicated by arrows in A) is not staining but endogenous pigments. Scale bars, 50 µm.