The efficiency of different enzymes in hydrolyzing Pleurotus geesteranus protein (PGP). (a) TCA-soluble peptide content in PGP and its hydrolysates; Data are expressed as mean ± SD (n = 3). Bars with different alphabets indicate statistically significant difference between the means (p < 0.05). (b) Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) profile of PGP and its hydrolysates generated by various enzymes; 20 μg of protein were loaded into the corresponding lane. M, marker; Pap-H, papain hydrolysate; Alc-H, alcalase hydrolysate; Fla-H, flavourzyme hydrolysate; Pep-H, pepsin hydrolysate; Pan-H, pancreatin hydrolysate.