7189
In avian erythroid progenitors , steroid hormones cooperate with tyrosine kinase receptors to induce renewal of erythroid progenitors .
 erythroid progenitors, tyrosine kinase receptors, erythroid progenitors
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:
 erythroid progenitors, tyrosine kinase receptors, erythroid progenitors