Chains and heterogens:
PDB Chain Sequences:
>1aqn_ (-) aqsvpygvsqikapalhsqgycgsnvkvavidsgidsshpdlkvaggasfvpsetnpfqd nnshgthvagtvaalnnsigvlgvapcaslyavkvlgadgsgqyswiingiewaiannmd vinmslggpsgsaalkaavdkavasgvvvvaaagnegtsgssstvgypakypsviavgav dssnqrasfssvgpeldvmapgvsicstlpgnkygaksgtsmasphvagaaalilskhpn wtntqvrsslentttklgdsfyygkglinvqaaaq