Figure 1. Reductive cleavage of the azo dye methyl red (MR) (Wong and Yuen 1996)

From

Microbial Decolorization of the Azo Dye Methyl Red by Enterobacter spp. ETL-1979

Maulin P Shah, Kavita A Patel, Sunu S Nair, A M Darji

Journal of Applied & Environmental Microbiology. 2013, 1(1), 1-5 doi:10.12691/jaem-1-1-1