>4tw1O (O:) observed residues (from ATOM records)
gdtkmytrtattsdsqknitqslqfnfltepnydketvfikakgtigsglrildpngywn
stlrwpgsysvsiqnvddnnntnvtdfapknqdesrevkytygyktggdfsitgnitkes
nysetisyqqpsyrtlldqstshkgvgwkveahlinnmghdhtrqltndsdnrtkseifs
ltrngnlwakdnftpkdkmpvtvsegfnpeflavmshdkkdkgksqfvvhykrsmdefki
dwnrhgfwgywsgenhvdkkeeklsalyevdwkthnvkfvkvl