2430
In hematopoietic system, RA and RARs , predominantly RAR alpha may play key roles for the proliferation and differentiation of hematopoietic progenitors .
 protein: RAR alpha; cell type: hematopoietic progenitors; protein: RARs
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: RAR alpha, hematopoietic progenitors, RARs 
Answer:
 protein: RAR alpha; cell type: hematopoietic progenitors; protein: RARs