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Fig. 3. Trail-following swimming pattern of N. succinea upon encountering
a trail of CSSG at an oblique angle. (A) Two CSSG trails were present, as
outlined. The concentration of CSSG in the syringe was 10–7
mol l–1, yielding a trail concentration
<10–8 mol l–1. (A–D) Successive
images of the path swum by the animal (indicated by the broken line in D). The
10 cm calibration in A applies to all parts.