>4m21A (A:) observed residues (from ATOM records)
mteyklvvvgacgvgksaltiqliqnhfvdiedsyrkqvvidgetslldildtagqsamr
dqymrtgegfllvfainntksfedihhyreqikrvkdsedvpmvlvgnksdlpsrtvdtk
qaqdlarsygipfietsaktrqgvddafytlvreirkhk