Example growth curves ±SD of the positive control, the negative control, two inactive, and two strongly inhibitory cell-free supernatants from an initial screening assay.

<p>Higher optical density at 492(y-axis, OD₄₉₂) indicates greater <i>Bd</i> growth. Day 0 OD₄₉₂ varies with original cell-free supernatant color, which is corrected for in calculations (see Methods).