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Fig. 1. Effect of the unc-23 bent-head phenotype on movement. (A)
Morphology of typical wild-type and unc-23 worms. The bend in the
head of the unc-23 mutant is indicated by an arrow. (B) Comparison of
dispersion and chemotaxis behavior for wild-type (Biii,Biv) and
unc-23 mutant (Bi,Bii) animals. Shown are representative tracks made
by individual unc-23 mutants and wild-type animals in the absence of
a gradient (Bi,Biii) and in the presence of a radial gradient of chemical
attractant (NH4Cl; Bii,Biv). The unc-23 track comprises a
series of curls visible in the expanded inset. Note that the handedness of the
curls, indicative of turning bias (clockwise), is opposite to the handedness
of the spiral track (counterclockwise). Pirouette initiation events are
indicated by orange crosses superimposed on the magnified track within the
inset. Animals were started near asterisks; the gradient peak is indicated by
the plus sign. Color represents time, as shown in the key. Elapsed time was 20
min for tracks Bi, Biii and Biv, and 90 min for the track in Bii. (C,D)
Distributions of turning bias and instantaneous speed for wild-type (black
lines) and unc-23 mutant (solid gray bars) animals. Arrowheads
indicate the average for each distribution.
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