Epitope insertion site in each gene. RACE analysis confirmed that the epitope is inserted precisely at the known exon/exon boundaries in analyzed proteins. The mini-exon is indicated as a grey box in each gene. The position of the myc-epitope relative to the full-length protein for each gene is indicated by an amino acid position (indicated as a number). HRNPA1: heterogeneous nuclear ribonucleoprotein A1; CHC1: regulator of chromosome condensation 1; SLC25A3: phosphate carrier precursor isoform 1b; ATP5B: beta-ATP synthase; SERPINE1: type 1 plasminogen activator inhibitor; ACTB: beta-actin.