15453
The data demonstrate the effect of protein density on conformational flexibility and dimensions of the receptors and provide the first structural characterization of functional membrane - embedded AMPARs , thus laying the foundation for correlated structure - function analyses of the predominant mediators of excitatory synaptic signals in the brain .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None