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Fig. 6. All control strains responded normally to a series of four temporal waves
of cAMP generated in the absence of spatial gradients of cAMP. In the first of
each set of panels, the mean instantaneous velocity is plotted as a function
of time for 10 cells treated with four successive waves of cAMP. The velocity
surge occurs in each case in the front of the wave and ends as the wave
reaches its peak (dashed lines). In the second two of each set of panels,
difference pictures were generated during the front of the wave (phase B) and
during the peak and back of the wave (phases C and D) for representative
cells. The difference pictures for the peak of the wave (phase C) span the
first four and those for the back of the wave (phase D) span the last eight of
each set of difference pictures under the heading `Phase C and D'. Green
represents expansion zones and red contraction zones in the difference
pictures.
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