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Fig. 1. In a liquid environment, after a long initial swim, worms alternate between
swimming (A) and quiescence (B). (C) Typical swimming–quiescent pattern
for an individual worm. 1, swimming; 0.5, slow swimming; and 0, quiescence
(see Materials and methods). At time 0 the worm was transferred from the
surface of solid media into liquid. (D) Swimming (gray) and quiescent (black)
behavior for typical worms of five species and four C. elegans
strains. N2 (Bristol) is the wild-type strain used in this study; the N2 data
are from C. (E) Coiled posture in liquid (25°C) of a worm lacking ACh
[cha-1(y226ts)]. (F) Sinusoidal quiescent posture of
egl-4(ks60) mutant worms.