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This review summarizes the current knowledge of the biosynthesis of tetrapyrroles in plants, key stages of this process regulation, as well as the available data on the participation of these compounds in the induction and transmission of retrograde signals. Possible sources of retrograde signals are considered. Par ticular attention is paid to the analysis of data on the signaling molecules that induce retrograde regulation. The interaction of retrograde signals with other cells signaling pathways is emphasized.

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