using an immunological probe , we have determined that the synthesis of the bacillus subtilis rna polymerase promoter specificity determinant sigma 29 is a developmentally regulated event . sigma 29 is absent from vegetatively growing cells but is abundant in sporulating cells for a restricted ( 2-h ) period during differentiation ( hour 2 to hour 4 into the sporeforming process ) .
C0086860
specificity
C0007634
cells