Abstract Background Chemical-in-plug assays are commonly used to study bacterial chemotaxis. sometimes in the absence of stringent controls. Results We report that non-chemotactic and non-motile mutants in two distinct bacterial species (Shewanella oneidensis and Helicobacter pylori) show apparent zones of accumulation or clearing around test plugs containing potential attractants or ... https://www.spidertattooz.com/WAC-4011-LED-Horizontal-Step-Light-Colorscaping/