Chains and heterogens:
PDB Chain Sequences:
>1kyfA (A:) gspgirlgssednfarfvcknngvlfenqllqiglksefrqnlgrmfifygnktstqfln ftptlicaddlqtnlnlqtkpvdptvdggaqvqqvvniecisdfteapvlniqfryggtf qnvsvklpitlnkffqptemasqdffqrwkqlsnpqqevqnifkakhpmdteitkakiig fgsalleevdpnpanfvgagiihtkttqigcllrlepnlqaqmyrltlrtskdtvsqrlc ellseqf