(1) Lauroylation-assisted workflow for PICS using E. coli proteome-derived tryptic peptide libraries which were blocked (succinylation or dimethylation). (2) Lauroylation-assisted N-terminomics to profile protein N-termini, ORF and non-ORF protein N-termini, using etoposide-treated cholangiocarcinoma cells by exploiting negative selection.