Effect of the heat treatment and proteinase K on the toxicity of protein extracted from PtC1015 clone. (A) The mortality rate was affected by the digestion of proteinase K. ●, Soluble fraction without proteinase K digestion; ■, Insoluble fraction without proteinase K digestion; ○, Soluble fraction with proteinase K digestion; □, Insoluble fraction with proteinase K digestion. (B) The mortality rate was affected by heat treatment. ●, Soluble fraction without heat treatment; ■, Insoluble fraction without heat treatment; ○, Soluble fraction with heat treatment; □, Insoluble fraction with heat treatment. All experiments were repeated at least three times and values were presented with standard deviation.