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Figure 3. Composite of spiral wave front positions at different times. The patterns shown in A were computed when potassium conductance (gK) was 1.13 units, whereas the patterns shown in B were computed when gK was 0.75 arbitrary time units. As time progressed, the spiral wave fronts rotated clockwise around a core of unexcited cells. The size of the core was related to the action potential duration (APD), as determined by the gK. The core was small for large conductances (short APD) and large for small conductances (long APD).




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