All 138 mACPs exhibited anticancer activity against at least three specific cell lines, as expressed by their IC50 values. We converted these values to their corresponding negative logarithmic transformations (pIC50) following the equation (Eq.1), where IC50 values are expressed in moles (M). A high value of pIC50 denotes strong inhibitory activity. Subsequently, we calculated the difference between the pIC50 maxima and minima (∆pIC50) reported for each peptide i from equation (Eq.2). This value was called the cancer cell-line selectivity index or CCSI. CCSI values greater than or equal to 0.5 indicate selective peptides (ACP-S), whereas values less than 0.5 are non-selective (ACP-NS). We identified 43 ACP-S and 95 ACP-NS. pIC50 = -log10(IC50) (Eq.1) CCSI = (∆pIC50)i = max(pIC50)i -min(pIC50)i (Eq.2)