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Fig. 4
Immunohistochemical staining of (a) Aqp1aa and (b) Aqp1ab in swimbladder gas gland tissue from European eel Anguilla anguilla. Both antibodies revealed positive staining, whereas (c) no background staining was observed in the negative control. Scale bars are 50, 100 or 200 μm, respectively. b: blood vessel; gg: gas gland cell; L: swimbladder lumen
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Full text @ J. Fish Biol.