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EKG and electrical cycle of the heart, unlabeled, loopable.1970-01-01T00:00:00+00:00Electrical activities of the heart accurately matching ECG waves, slow motion, seamless looping. PT58Shttps://d38zjy0x98992m.cloudfront.net/31d0d470-d404-11e3-af07-329e81129ea7/cardiac_conduction_ecg_loop_xlarge.jpghttps://d38zjy0x98992m.cloudfront.net/31d0d470-d404-11e3-af07-329e81129ea7/cardiac_conduction_ecg_loop_mp4_hd_video.mp4