4371
Interferons as well as retinoids inhibit the growth of NB4 cells , although the 2 classes of compounds do not significantly interact in terms of anti-proliferative activity .
 cell line: NB4 cells; protein: Interferons
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: NB4 cells, Interferons 
Answer:
 cell line: NB4 cells; protein: Interferons