Chains and heterogens:
PDB Chain Sequences:
>1k4vA (A:) esklklsdwfnpfkrpevvtmtkwkapvvwegtynravldnyyakqkitvgltvfavgry iehyleefltsankhfmvghpvifyimvddvsrmplielgplrsfkvfkikpekrwqdis mmrmktigehivahiqhevdflfcmdvdqvfqdkfgvetlgesvaqlqawwykadpndft yerrkesaayipfgegdfyyhaaifggtptqvlnitqecfkgilkdkkndieaqwhdesh lnkyfllnkptkilspeycwdyhiglpadiklvkmswqtkeynvvrnnv
>1k4vA (A:) klklsdwfnpfkrpevvtmtkwkapvvwegtynravldnyyakqkitvgltvfavgryie hyleefltsankhfmvghpvifyimvddvsrmplielgplrsfkvfkikpekrwqdismm rmktigehivahiqhevdflfcmdvdqvfqdkfgvetlgesvaqlqawwykadpndftye rrkesaayipfgegdfyyhaaifggtptqvlnitqecfkgilkdkkndieaqwhdeshln kyfllnkptkilspeycwdyhiglpadiklvkmswqtkeynvvrnnv
>1k4vB (B:) esklklsdwfnpfkrpevvtmtkwkapvvwegtynravldnyyakqkitvgltvfavgry iehyleefltsankhfmvghpvifyimvddvsrmplielgplrsfkvfkikpekrwqdis mmrmktigehivahiqhevdflfcmdvdqvfqdkfgvetlgesvaqlqawwykadpndft yerrkesaayipfgegdfyyhaaifggtptqvlnitqecfkgilkdkkndieaqwhdesh lnkyfllnkptkilspeycwdyhiglpadiklvkmswqtkeynvvrnnv
>1k4vB (B:) klklsdwfnpfkrpevvtmtkwkapvvwegtynravldnyyakqkitvgltvfavgryie hyleefltsankhfmvghpvifyimvddvsrmplielgplrsfkvfkikpekrwqdismm rmktigehivahiqhevdflfcmdvdqvfqdkfgvetlgesvaqlqawwykadpndftye rrkesaayipfgegdfyyhaaifggtptqvlnitqecfkgilkdkkndieaqwhdeshln kyfllnkptkilspeycwdyhiglpadiklvkmswqtkeynvvrnnv