STRING 9.05 
HBB [ENSP00000333994]
 
hemoglobin, beta; Involved in oxygen transport from the lung to the various peripheral tissues
HBA1 [ENSP00000322421]
 
hemoglobin, alpha 1; Involved in oxygen transport from the lung to the various peripheral tissues (By similarity)
Evidence suggesting a functional link:
Neighborhood in the Genome:  
none / insignificant.
    
Gene Fusions:  
none / insignificant.
    
Cooccurence Across Genomes:  
none / insignificant.
    
Co-Expression:   yes (score 0.645).  
Experimental/Biochemical Data:   yes (score 0.999).  
Association in Curated Databases:   yes (score 0.900).  
Co-Mentioned in PubMed Abstracts:   yes (score 0.672).  
Combined Score:
 
0.999
 
Note: the two proteins have some sequence similarity (136.2 bits over 138 amino acids. click here to see the alignment).
Evidence for specific actions:
Binding:yes (score: 0.962)