5302
Among GPCRs , type - 1 and type - 2 cannabinoid receptors , the molecular targets of endocannabinoids ( eCBs ) , control many physiological and pathological processes through the activation of several signal transduction pathways .
 None
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