1488
In addition to activation of phospholipase C gamma 1 , ligation of this receptor also seems to activate a calcium -independent , CD28 -specific pathway .
 CD28, phospholipase C gamma 1
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 CD28, phospholipase C gamma 1