M2 medium for co-culturing Cyanobacteria, such as S. elongtatus, together with heterotrophic bacteriaSlighly modified from: Weiss, Taylor L., Eric J. Young, and Daniel C. Ducat. "A synthetic, light-driven consortium of cyanobacteria and heterotrophic bacteria enables stable polyhydroxybutyrate production." Metabolic engineering 44 (2017): 236-245.