PKD, vs WT). After protein extraction and reductive alkylation, samples were treated with TMT16plex for labelling of protein N-termini and cleavage events; then digested with trypsin. Measurements of this experiment were performed via Q-Exactive plus and searched using FragPipe. To evaluate the potential effect of protein extraction methods on the identification of cleavage events, we performed a pilot experiment with samples from the same PKD model. Tissues from 3 mice for each condition (KO or WT) were subjected to protein extraction using beat beating, and two sonication approaches. Then processed with trypsin and measured in label-free DIA model in a timsTOF flex and searched in Spectronaut.]]>