the symexp data may not always be consistent with the biomt transformations..although they turn out to be..
considering the case of 3hh7...the biological unit and asymm unit are same...to form a dimer of this protein...i cannot find a clue by biomt data

REMARK 350 APPLY THE FOLLOWING TO CHAINS: A, B                                  
REMARK 350   BIOMT1   1  1.000000  0.000000  0.000000        0.00000            
REMARK 350   BIOMT2   1  0.000000  1.000000  0.000000        0.00000            
REMARK 350   BIOMT3   1  0.000000  0.000000  1.000000        0.00000