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A focal seizure characterized at onset by sudden loss or diminution of muscle tone without apparent preceding myoclonic or tonic activity, typically lasting more than 500 ms but less than 2 seconds. It may involve the head, trunk, jaw or limb musculature. [ORCID:0000-0002-1735-8178, PMID:11580774, PMID:28276060, PMID:28276064]
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