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| A. | Resting fluorescence image of the preparation (left atrium and ventricle). |
| B. | A movie showing the sinus rhythm in the atrium and the fibrillation in the ventricle. |
| C. | Traces from the atrium and the ventricle taken at 1Khz frame rate. |
| D. | Traces from the atrium and the ventricle taken at 500Hz frame rate. The traces (C and D) were averaged from 9 (= 3x3) pixels with no temporal filtering. |