6050
However, disruption of a membrane-proximal proline-rich sequence motif (' box1 ') in either subunit of the bipartite IL-4R abolished not only ligand-induced tyrosine phosphorylation of Janus kinases JAK1 and JAK3 , but also IL-4 -triggered activation of STAT5 and concomitant cell proliferation .
 box1, bipartite IL-4R, JAK3, STAT5, JAK1, Janus kinases, membrane-proximal proline-rich sequence motif, IL-4
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:
 box1, bipartite IL-4R, JAK3, STAT5, JAK1, Janus kinases, membrane-proximal proline-rich sequence motif, IL-4