>2xnaB (B:) observed residues (from ATOM records)
dggitqspkylfrkegqnvtlsceqnlnhdamywyrqdpgqglrliyysqivndfqkgdi
aegysvsrekkesfpltvtsaqknptafylcasssrssyeqyfgpgtrltvtedlknvfp
pevavfepseaeishtqkatlvclatgfypdhvelswwvngkevhsgvctdpqplkeqpa
lndsryslssrlrvsatfwqnprnhfrcqvqfyglsendewtqdrakpvtqivsaeawgr
a