STRING 9.05 
DQB1 [ENSP00000382034]
HLA class II histocompatibility antigen, DQB1*0602 beta chain Precursor (DQ(5))(DC-1)
HLA-DXA [ENSP00000364076]
HLA class II histocompatibility antigen, DQ alpha 2 chain Precursor (HLA class II histocompatibility antigen, DQ(6) alpha chain)(DX alpha chain)(HLA-DQA1)
Evidence suggesting a functional link:
Neighborhood in the Genome:  
none / insignificant.
Gene Fusions:  
none / insignificant.
Cooccurence Across Genomes:  
none / insignificant.
none / insignificant.
Experimental/Biochemical Data:   yes (score 0.621).  
Association in Curated Databases:   yes (score 0.540).  
Co-Mentioned in PubMed Abstracts:   yes (score 0.752).  
Combined Score:
Note: the two proteins have some sequence similarity (79 bits over 131 amino acids. click here to see the alignment).
Evidence for specific actions:
Binding:yes (score: 0.540)