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The light chain is known as β2-microglobulin and is similar in structure to one of the heavy chain domains. It is not membrane associated but binds to the α3-domain of the heavy chain
 
The light chain is known as β2-microglobulin and is similar in structure to one of the heavy chain domains. It is not membrane associated but binds to the α3-domain of the heavy chain
[[Image:MHC I Structure.jpg|thumb|right|175px| Structure of MHC I molecule - Copyright Prof Dirk Werling DrMedVet PhD MRCVS]]
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[[Image:MHC I Structure.jpg|thumb|right|200px| Structure of MHC I molecule - Copyright Prof Dirk Werling DrMedVet PhD MRCVS]]
    
The MHC class I domains are structurally and genetically related to immunoglobulin and TcR domains; the outer domains (α1 and α2) are like the variable domains and the α3 domain and β2m are like the constant domains.
 
The MHC class I domains are structurally and genetically related to immunoglobulin and TcR domains; the outer domains (α1 and α2) are like the variable domains and the α3 domain and β2m are like the constant domains.
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