>1tk6D (D:) observed residues (from ATOM records)
aratagevegsdalrmdadraeqcvdalnadlanvyvlyhqlkkhhwnvegaefrdlhlf
lgeaaetaeevadelaervqalggvphaspetlqaeasvdvededvydirtslandmaiy
gdiieatrehtelaenlgdhatahmlreglieleddahhiehyleddtlvtqgal