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Effect of deleting the COS in the emp (A), vwb (B), and eap (C) promoters. A β-galactosidase assay was used for measuring emp and vwb promoter activity, and the bioluminescence assay described in Harraghy et al. (19) was used for measuring eap expression. The data shown are the means ± standard errors of the means of the results of at least two independent experiments. RLU, relative light units.
