Glass R E, Goman M, Errington L, Scaife J
Mol Gen Genet. 1975 Dec 30;143(1):79-83. doi: 10.1007/BF00269423.
Studies on the rate of synthesis of the beta and beta' subunits of RNA polymerase in haploid strains of Escherichia coli K12 containing poorly-suppressed rif degrees am mutations provide conclusive evidence that synthesis of at least these two subunits is regulated.