8455
These results indicate that the adhesion of RA synovial cells to matrices such as hyaluronic acid through CD44 could up-regulate VCAM-1 expression and VCAM-1 -mediated adhesion to T cells , which might in turn cause activation of T cells and synovial cells in RA synovitis .
 T cells, VCAM-1, T cells, synovial cells, CD44, VCAM-1, RA synovial cells
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:
 T cells, VCAM-1, T cells, synovial cells, CD44, VCAM-1, RA synovial cells