13839
Porcine MHC class II antigens are potent stimulators of direct T-cell recognition by human CD4+ T cells and are, therefore, likely to play an important role in the rejection responses to transgenic pig donors in clinical xenotransplantation .
 cell type: human CD4+ T cells; protein: Porcine MHC class II antigens
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: human CD4+ T cells, Porcine MHC class II antigens 
Answer:
 cell type: human CD4+ T cells; protein: Porcine MHC class II antigens