5447
Since the function of 9E3 / CEF4 is unknown , we examined the effect of the protein on mitogenicity and chemotaxis , as well as its expression , in fibroblasts and peripheral blood cells .
 fibroblasts, peripheral blood cells
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Anatomy 
Text: {0} 
Answer:
 fibroblasts, peripheral blood cells