4217
Interleukin-7 ( IL-7 ) stimulates the proliferation of normal and leukemic B and T cell precursors and T lymphocytes .
 Interleukin-7, IL-7
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:
 Interleukin-7, IL-7