Chains and heterogens:
PDB Chain Sequences:
>1cra_ (-) shhwgygkhngpehwhkdfpiakgerqspvdidthtakydpslkplsvsydqatslriln nghafnvefddsqdkavlkggpldgtyrliqfhfhwgsldgqgsehtvdkkkyaaelhlv hwntkygdfgkavqqpdglavlgiflkvgsakpglqkvvdvldsiktkgksadftnfdpr gllpesldywtypgslttppllecvtwivlkepisvsseqvlkfrklnfngegepeelmv dnwrpaqplknrqikasfk