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Several CAMs have been identified at the neuromuscular junction and at central synapses , where they regulate synaptic strength , by recruiting scaffolding proteins , neurotransmitter receptors and synaptic vesicles in response to the binding of counter - receptors across the synaptic cleft .
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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