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However, during maturation of both lineages (days 21 and 28), increased expression of a functionally distinct 80 kDa STAT5 isoform was observed, resulting in heterodimer DNA-binding complexes containing both the 94 and 80 kDa STAT5 proteins .
 80 kDa STAT5 isoform, heterodimer DNA-binding complexes, STAT5 proteins
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:
 80 kDa STAT5 isoform, heterodimer DNA-binding complexes, STAT5 proteins