25913
In HEK293 cells stably expressing human GPR55 ( HEK - GPR55 ) , the compound behaved as an antagonist on LPI - mediated Ca2 + release and extracellular signal - regulated kinases ( ERK1 / 2 ) activation , but not in HEK293 cells expressing cannabinoid receptor 1 or 2 ( CB1 or CB2 ) .
 Chemical: LPI; Chemical: Ca2 +
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: LPI; Chemical: Ca2 +