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stage V sporulation protein AD Bacillus and Clostridium species contain about 10 % dipicolinic acid (pyridine-2,6-dicarboxylic acid) by weight. This protein family, SpoVAD, belongs to the spoVA operon that is suggested to act in the transport of dipicolinic acid (DPA) from the mother cell, where DPA is synthesized, to the forespore, a process essential to sporulation. Members of this protein family are found, so far, in exactly those species believed capable of endospore formation. [Cellular processes, Sporulation and germination]
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Jiyao W et al.(2023). "The conserved domain database in 2023.",