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It is concluded that the bcr1 type-pml/RAR alpha fusion protein of APL contains an antigenic site, absent from the normal parent molecules and recognized by human CD4+ lymphocytes .
 bcr1 type-pml/RAR alpha fusion protein, APL, human CD4+ lymphocytes
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:
 bcr1 type-pml/RAR alpha fusion protein, APL, human CD4+ lymphocytes