STRING 9.05 
HLA-DMB [ENSP00000393646]
major histocompatibility complex, class II, DM beta; Plays a critical role in catalyzing the release of class II HLA-associated invariant chain-derived peptides (CLIP) from newly synthesized class II HLA molecules and freeing the peptide binding site for acquisition of antigenic peptides
HLA-DRA [ENSP00000372746]
major histocompatibility complex, class II, DR alpha
Evidence suggesting a functional link:
Neighborhood in the Genome:  
none / insignificant.
Gene Fusions:  
none / insignificant.
Cooccurence Across Genomes:  
none / insignificant.
Co-Expression:   yes (score 0.895).  
Experimental/Biochemical Data:   yes (score 0.621).  
Association in Curated Databases:   yes (score 0.540).  
Co-Mentioned in PubMed Abstracts:   yes (score 0.243).  
Combined Score:
Note: the two proteins have some sequence similarity (95 bits over 124 amino acids. click here to see the alignment).
Evidence for specific actions:
Binding:yes (score: 0.825)