Figure 8

ONPG analysis of AX4 cells expressing the lacZ gene under the prestalk promoter ecmA. Cells were developed alone or mixed at a 1:1 ratio with AX4 and chtB cells. Developmental time points (hours) are represented on the x-axis and beta-galactosidase activity on the y-axis. β-galactosidase activity did no differ when AX4[ecmA/lacZ] cells are mixed with AX4 or with chtB.