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Expression of vapBC-1 over the cell cycle. (A) The β-galactosidase activity of the R2866 vapBC-1 promoter fusion (curve) is inversely related to culture density (bars). (B) The 86-028NP vapBC-1 promoter fusion (curve) displays lower initial β-galactosidase activity than the R2866 fusion but mirrors the trend toward decreasing expression with increasing culture density (bars). OD, optical density.
