| PDB codes | 
        Observed    mutations | 
       
      
        | 1HPV | 
        N37S | 
       
      
        | 1T7J | 
        Q7K,K14R,L63P,V82T,I84V | 
       
      
        | 3EKP | 
        Q7K,L10I,K14R,R41K,G48V,I54V,L63P,V82A | 
       
      
        | 3EKV | 
        Q7K,K14R,R41K,L63P | 
       
      
        | 3EM3 | 
        Q7K,K14R,R41K,I50L,L63P,A71V | 
       
      
        | 3NU3 | 
        Q7K,L33I,N37S,L63I,C67A,C95A | 
       
      
        | 3NU4 | 
        Q7K,V32I,L33I,N37S,L63I,C67A,C95A | 
       
      
        | 3NU5 | 
        Q7K,L33I,N37S,I50V,L63I,C67A,C95A | 
       
      
        | 3NU6 | 
        Q7K,L33I,N37S,I54M,L63I,C67A,C95A | 
       
      
        | 3NU9 | 
        Q7K,L33I,N37S,L63I,C67A,I84V,C95A | 
       
      
        | 3NUJ | 
        Q7K,L33I,N37S,I54V,L63I,C67A,C95A | 
       
      
        | 3NUO | 
        Q7K,L33I,N37S,L63I,C67A,L90M,C95A | 
       
      |