9300
Thus, qualitative differences in the capacity to regulate these factors could not be shown in fetal blood cells .
 cell type: fetal blood cells
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: fetal blood cells 
Answer:
 cell type: fetal blood cells