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Quadrant assay used to measure attractive and repulsive properties of icas#3 and mbas#3. (a) Agar plates were divided into quadrants, with opposite quadrants containing icas#3 at 1 pM or mbas#3 at 10 nM. Worms were placed into the center of the plate and their location tracked over time. (b) Chemotaxis indices measured for icas#3 and mbas#3. See Srinivasan et al.12 for methods.
