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Movie S2
Intermediate regular heartbeat (Fig. 1-III). Transverse T1w-MRI of slow regular heartbeat of Mytilus galloprovincialis with IR-PPG of a double upward peak. Averaged images of 4 beats from 249 sec are presented by 2.56 times speed. Heart rate is 9.4 bpm. Slice position is set at the AV valve.