7586
Moreover, RA induced apoptosis of CD34+ cells and CD34+CD71+ cells stimulated with erythropoietin .
 CD34+ cells, erythropoietin, CD34+CD71+ 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:
 CD34+ cells, erythropoietin, CD34+CD71+ cells