9387
Moreover , recent data from different laboratories show that after brain ischemic episodes melanocortins activate the transcription of neurotrophins and their receptors in the cerebral cortex and in the hippocampus , and increase the proliferation of progenitor neuron cells .
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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:
 None