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Fig. 6. Freshwater-type mitochondria-rich (chloride) cell, `intermediate' cell and
apical crypt density on the apical surface of northern (black) and southern
(grey) killifish gills before (N=3) and 8 days after transfer from
brackish water (10 g l-1) to freshwater (N=5). Data are
expressed as means ± S.E.M.
*Significant difference from brackish water control.
Significant difference from northern population
(P<0.05).