Co-culturing C. reinhartdii and Synechococcus sp. PCC 7002. The C. reinhartdii sta6 mutant was grown with alginate bead immobilized Synechococcus sp. PCC 7002 wild-type cells (blue squares), glgA1 cells (green diamonds), and with empty beads (red triangles) in co-culture on modified TAP media without acetate at pH 7.0. Growth of Synechococcus sp. PCC 7002 cells leaking out of the beads is shown in gray squares. Acetate production by alginate bead immobilized Synechococcus sp. PCC 7002 glgA1 mono-culture is shown in stars. The inset shows alginate beads of Synechococcus sp. (left) and an empty bead (right).