an apical sodium proton exchanger and a basolateral Na, K-ATPase.
Schwarz and Graszynski and their collaborators have
developed a split-lamella preparation of the posterior gills
of E. sinensis. Their results are consistent with coupled sodium and chloride uptake in
the gills of sea water-acclimated crabs and with independent
mechanisms for sodium and chloride absorption in
the gills of freshwater-acclimated crabs.