Assertion: chloroplast's protein | /r/HasProperty | required for pep activity
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Source sentences:
text: Notably, the reduced plastid transcriptional activity in rps10 coincides well with the down-regulation of the transcript level of numerous nuclear genes encoding components of the chloroplast transcription machinery, like sigma factors and PEP-associated proteins that are required for PEP activity (figure 1b; electronic supplementary material, figure S1).