20881
Thus , in 158N cells , the ability of oxysterols to trigger a mode of cell death by apoptosis involving GSK - 3 and caspase - 3 activation is independent of the increase in the Ca ( 2 + ) level and of their accumulation in lipid raft microdomains .
 oxysterols, Ca ( 2 + )
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 oxysterols, Ca ( 2 + )