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Fig. 2. Carbonic anhydrase activity (µmol CO2 mg
protein1 min1) in anterior (G4, black
bars) and posterior (G8, gray bars) gills of green crabs acclimated to 32
p.p.t. 32, 32 p.p.t. acclimated controls; Sham, intact crabs injected daily
with filtered seawater for 7 days; ESA, eyestalk ablated crabs assayed after 7
days; ESA-inj, eyestalk ablated crabs injected daily with eyestalk extract and
assayed after 7 days. Values are means ± s.e.m.
(N=610). T=12°C. Asterisks indicate statistical
differences at P<0.05 in G4 and G8 vs the corresponding
gill in the 32 p.p.t. controls.