13335
The two Duffy polymorphic antigens , Fya and Fyb (coded by the FY*A and FY*B alleles ), are present on erythrocyte membranes .
 protein: erythrocyte membranes; protein: Duffy polymorphic antigens; protein: Fya; protein: Fyb
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: erythrocyte membranes, Duffy polymorphic antigens, Fya, Fyb 
Answer:
 protein: erythrocyte membranes; protein: Duffy polymorphic antigens; protein: Fya; protein: Fyb