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Fig. 3. Behaviours elicited in control animals by touching three locations on the
body. (A) Distribution of behaviours elicited by touching the anterior, the
midbody or the posterior of the leech (N=22). The most common
response varied with touch location: shortening at the anterior, local bending
in the midbody, and crawling at the posterior. (B) Distribution of behaviours
along the CCA1 behaviour score axis. (C) Distribution of individual CCA1
scores. The distribution of behavioural responses elicited by touch at the
anterior are farthest from the distribution of behaviours elicited by touch at
the posterior; the distribution of responses to midbody stimulation lies
between the other two. See Table
1 for a description of the behaviours.