STRING 9.1 
There are several matches for 'P20039'.
Please select one from the list below and press Continue to proceed.
 
  
 
 organism  protein 
 Homo sapiens 
HLA-DR15 - HLA class II histocompatibility antigen, DRB1-15 beta chain Precursor (MHC class I antigen DRB1*15)(DW2.2/DR2.2)
 Homo sapiens 
DRB52 - HLA class II histocompatibility antigen, DRB1-11 beta chain Precursor (MHC class II antigen DRB1*11)(DRw11)(DR-5)(DR5)