2673
These results indicate that RA directly inhibits the erythroid differentiation program at the level of early adult HPC , and may lead to a shift from the erythroid to granulocytic differentiation pathway .
 cell type: HPC
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: HPC 
Answer:
 cell type: HPC