?:definition
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A generalized tonic seizure is a type of generalized motor seizure characterised by bilateral limb stiffening or elevation, often with neck stiffening without a subsequent clonic phase. The tonic activity can be a sustained abnormal posture, either in extension or flexion, sometimes accompanied by tremor of the extremities. [HPO:jalbers, HPO:probinson, PMID:11580774, PMID:28276060, PMID:28276064]
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