Fig. 1. acc embryos exhibit an aberrant response to touch. Embryos (24 hpf) were stimulated by touching them with forceps. (A) Touch induced a wild-type embryo to coil twice within 1 second. Relaxation of the trunk after the second coil took less than 0.5 seconds. (B) Touch induced an acc embryo to contract both sides in an apparent simultaneous fashion to cause the trunk to bend dorsally followed by a slow relaxation (>4 seconds).