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Fig. 6. Effect of calcium concentration on the stimulation by endogenous protein
kinases of Na+/K+-ATPase activity in foot muscle
extracts from active snails. In vitro incubations stimulated PKA, PKC
or PKG and the resulting change in Na+/K+-ATPase
activity is expressed as a percentage of the activity in control incubations
where protein kinases were not stimulated. Other information as in
Fig. 4.
*Significantly different from the corresponding incubation with
zero calcium concentration; Student's t-test, P<0.01.