Chains and heterogens:
PDB Chain Sequences:
>3pgkA (A:) slssklsvqdldlkdkrvfirvdfnvpldgkkitsnqrivaalptikyvlehhpryvvla shlgrpngernekyslapvakelqsllgkdvtflndcvgpeveaavkasapgsvillenl ryhieeegsrkvdgqkvkaskedvqkfrhelssladvyindafgtahrahssmvgfdlpq raagfllekelkyfgkalenptrpflailggakvadkiqlidnlldkvdsiiigggmaft fkkvlenteigdsifdkavgpeiaklmekakakgvevvlpvdfiiadafsasantktvtd kegipagwqgldngpesrklfaatvakatvilwngppgvfefekfaagtkalldevvkss aagntviigggdtatvakkygvtdkishvstgggaslellegkelpgvaflsekk