Male blue crabs (Callinectes sapidus Rathbun) were acclimated to salinities of 5 and 34 o/oo. Microsomal preparations of gills from these animals possessed Na+ + K+-dependent ATPase specific activities of 2.33 0.10 and 1.29 -+ 0.11 pmoles P i m i n per mg protein respectively, implicating the
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