Chains and heterogens:
PDB Chain Sequences:
>1sqmA (A:) peivdtcslaspasvcrtkhlhlrcsvdftrrtltgtaaltvqsqednlrslvldtkdlt iekvvingqevkyalgerqsykgspmeislpialsknqeivieisfetspkssalqwltp eqtsgkehpylfsqcqaihcrailpcqdtpsvkltytaevsvpkelvalmsairdgetpd pedpsrkiykfiqkvpipcylialvvgalesrqigprtlvwsekeqveksayefsetesm lkiaedlggpyvwgqydllvlppsfpyggmenpcltfvtptllagdkslsnviaheishs wtgnlvtnktwdhfwlneghtvylerhicgrlfgekfrhfnalggwgelqnsvktfgeth pftklvvdltdidpdvayssvpyekgfallfyleqllggpeiflgflkayvekfsyksit tddwkdflysyfkdkvdvlnqvdwnawlyspglppikpnydmtltnacialsqrwitake ddlnsfnatdlkdlsshqlneflaqtlqraplplghikrmqevynfnainnseirfrwlr lciqskwedaiplalkmateqgamkftrplfkdlaafdkshdqavrtyqehkasmhpvta mlvgkdlkvd