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Fig. 2. Changes in specific activities (i.u. mg-1 protein) of enzymes of
glycogen metabolism in tissues of Fundulus grandis held under normal
and reduced oxygen levels for 4 weeks at 27°C. The y axis represents the
percentage change in the mean value for each enzyme measured from hypoxic fish
relative to the normoxic value for (A) skeletal muscle and (B) liver.
Asterisks indicate significant differences between mean specific activity
values from normoxic and hypoxic groups (*P
0.05;
**P
0.001; see Table
2). GPase, glycogen phosphorylase; GSase, glycogen synthase.