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The transcription of photosynthesis genes in chloroplasts is largely mediated by the plastid‐encoded RNA polymerase (PEP), which resembles prokaryotic‐type RNA polymerases, but with plant‐specific accessory subunits known as plastid transcriptionally active chromosome proteins (pTACs) or PEP‐associated proteins (PAPs). However, whether additional factors are involved in the biogenesis of PEP complexes...