420
The identified , differentially regulated drug targets are enriched in G - protein coupled receptors ( GPCRs ) ( Figure S4 ) , in agreement with previous reports that members of the GPCR family are generally regulated by several mechanisms including receptor desensitization , endocytosis at the protein level and regulation of the cellular receptor content [ 18 ] , [ 19 ] .
 Anatomy: cellular
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
 Anatomy: cellular