7272
In late stages of erythroid maturation, GPA was upregulated, whereas CD34 , c-kit , PU.1 , and GATA-2 were barely or not detected.
 GPA, c-kit, PU.1, GATA-2, CD34
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:
 GPA, c-kit, PU.1, GATA-2, CD34