2019
Wild-type and chimeric HLF proteins also bound closely related sites identified previously for bZIP proteins of both the proline -and acidic amino acid-rich ( PAR ) and C/EBP subfamilies ; however, E2A- HLF proteins were significantly less tolerant of certain deviations from the HLF consensus binding site .
 HLF, HLF, C/EBP subfamilies, acidic amino acid-rich, bZIP proteins, proline, HLF, PAR, HLF consensus binding site, E2A- HLF, chimeric HLF 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:
 HLF, HLF, C/EBP subfamilies, acidic amino acid-rich, bZIP proteins, proline, HLF, PAR, HLF consensus binding site, E2A- HLF, chimeric HLF proteins