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Figure 1: AngiotensinIconverting enzyme inhibition of the crude extracts, hydrolysates, and fractions, (b) expressed as %/mg of Pachymelania aurita and Tympanotonus fuscatus and the ultrafiltered fractions, (a) expressed as IC_{50} values are expressed as mean ± standard deviation of duplicate determination. Bars with either same letters or asterisk (*) are significantly different from each other at P < 0.05. Where PA, TF, C, H, UFP, and UFR represent Pachymelania aurita, Tympanotonus fuscatus, crude, hydrolysate, ultrafiltered permeate, and ultrafiltered retentate, respectively 
