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Regulation of the expression of competence and sporulation factor (CSF) by spo0A. CSF is encoded by the phrC gene. spo0H encodes the ƠH, which is required by phrC to produce CSF. This spo0H is negatively regulated by the AbrB protein, which is antagonised by Spo0A protein. Deactivation of AbrB by Spo0A protein leads to optimal production of CSF.
