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Na+, K+-ATPase activity in cells of Fraction I (1.03–1.05 g/L Percoll density interface) and Fraction II (1.05–1.09 g/L Percoll density interface) isolated from gills of the freshwater mussel Lasmigona costata (a) and seawater clam Mesodesma mactroides (b). Data are expressed as mean ± standard error (n = 5). Different letters indicate significant different mean values among treatments (p < 0.05)
