>1u20A (A:) observed residues (from ATOM records)
dkprprnisreeslqlegykhachallhapsqaklfdrvpirrvllmmmrfdgrlgfpgg
fvdtrdisleeglkreleeelgpalatvevteddyrssqvrehpqkcvthfyikelklee
ierieaeavnakdhglevmglirvplytlrdrvgglpaflcnnfignsksqllyalrslk
llredqiqevlkashr