4360
Together , our work demonstrated that the kinase activity of EphA4 , via activation of downstream Cdk5 activity , mediates the scaling - down of excitatory synaptic strength under conditions of global activity elevation .
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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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