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The " latent period " between brain injury and clinical epilepsy is widely regarded to be a seizure - free , pre - epileptic state during which a time - consuming cascade of molecular events and structural changes gradually mediates the process of " epileptogenesis . " The concept of the " latent period " as the duration of " epileptogenesis " implies that epilepsy is not an immediate result of brain injury , and that anti - epileptogenic strategies need to target delayed secondary mechanisms that develop sometime after an initial injury .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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