is about chemotaxis assay evidence capillary assay evidence A type of chemotaxis assay evidence where the presence or absence of positive or negative chemotaxis is determined by measuring the rate of accumulation of the cells into a capillary. ECO:0005609 eco snadendla 2016-03-31T16:45:29Z To determine the presence of positive chemotaxis, an attractant is placed in the capillary and the presence of positive chemotaxis is determined based on the amount of organism that accumulated in the capillary. To determine the presence of negative chemotaxis, a repellent is added to the organismal suspension (but not in the capillary) and the organisms that fled into the capillary are measured. cell chemotaxis