4358
The kinase activities of EphA4 and its downstream effector Cdk5 were both required for homeostatic synaptic scaling , as overexpression of EphA4 with constitutively active kinase activity reduced excitatory synaptic strength , while interfering with either the kinase activity of EphA4 or Cdk5 blocked activity - induced synaptic scaling .
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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