6427
Freshly isolated T cells from lupus patients , rheumatoid arthritis ( RA ) patients , and normal individuals were activated physiologically via the TCR with anti-CD3 and anti-CD28 Abs to assess proximal membrane signaling, and with PMA and a calcium ionophore ( A23187 ) to bypass membrane-mediated signaling events .
 TCR, T cells, anti-CD3, anti-CD28 Abs
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:
 TCR, T cells, anti-CD3, anti-CD28 Abs