Fig. 5From: Phosphate regulator PhoP directly and indirectly controls transcription of the erythromycin biosynthesis genes in Saccharopolyspora erythraeaHigh-yield S. erythraea strain contains higher abundance of PhoP protein. a The growth curves of high-yield strain E3 and low-yield strain NRRL2338 in TSB. b Titers of erythromycin of two strains in TSB. c Western blot of lysates (8 μg of total protein) of the E3 and NRRL2338 strains at 16 h, 42 h, and 70 h with polyclonal antibody for PhoP. The band intensities were quantified by densitometry using ImageJ softwareBack to article page