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Figure 3


Fig. 3. Survey of heartbeat reversals, recorded by the IR-sensor beside the second abdominal segment. Black bars represent the periods of retrograde heart pulses. (A) Regular repetition of heartbeat reversals and intermittent bouts of abdominal contractions (D. hydei, male 3). (B) Series of three heartbeat periods in D. melanogaster (female 2). During retrograde pulses the mean transmittance level is higher than during forward pulses.