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We investigated the regulation of human PML expression by interferons ( IFNs ) and IL-1 in various human haematopoietic lines ( U937 , THP1 , HL60 , NB4 ), in human diploid fibroblasts and in human peripheral blood leukocytes .
 PML, IFNs, interferons, HL60, U937, human diploid fibroblasts, THP1, human peripheral blood leukocytes, IL-1, NB4, human haematopoietic lines
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:
 PML, IFNs, interferons, HL60, U937, human diploid fibroblasts, THP1, human peripheral blood leukocytes, IL-1, NB4, human haematopoietic lines