Assertion: mare's foal | /r/CapableOf | develop a head tremor
Facets:
value: usually
type: TEMPORAL
value: after six weeks of age
type: TEMPORAL
value: at some stage
type: TEMPORAL
Source sentences:
text: An affected foal is usually born without clinical signs, but at some stage, usually after six weeks of age, develops severe incoordination, a head tremor, wide-legged stance and other symptoms related to the death of the purkinje cells in the cerebellum.