5345
There is broad evidence that association of transmembrane receptors and signalling molecules with lipid rafts / caveolae provides an enriched environment for protein - protein interactions necessary for signal transduction , and a mechanism for the modulation of neurotransmitter and / or growth factor receptor function .
 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