8376
Ligation of either CD80 ( B7-1 ) or CD86 ( B7-2 ), two principal ligands for CD28 , is thought to skew the immune response toward Th1 or Th2 differentiation .
 CD80, CD86, B7-2, B7-1, CD28
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:
 CD80, CD86, B7-2, B7-1, CD28