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A common strategy for multi-protein expression is to link genes by self-cleaving 2A peptide sequences. Yet, little is known how the 2A peptide-derived N-terminal proline or adjacent non-native residues introduced during cDNA cloning affects protein stoichiometry. Polycistronic reprogramming constructs with altered KLF4 protein stoichiometry can influence induced pluripotent stem cell (iPSC) generation. We studied the impact of N-terminal 2A peptide-adjacent residues on the protein stability of two KLF4 isoforms, and assayed their capaci