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Fig. 7. Spherical cells have a long refractory period. Systematic stimulation of
the cell with pairs of intracellular steps shows that the threshold and
latency of the second spike depends on the delay between pulses. (A)
Superimposed traces obtained stimulating with four different test step
intensities (370, 380, 390 and 400 pA) at different delays from a conditioning
step (800 pA). (B) Spike latency vs amplitude of the test step
plotted for four different delays after a conditioning spike (data from
another cell). (C) Spike latency vs delay plot corresponding to the
experiment represented at the bottom row in A.
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