Chains and heterogens:
PDB Chain Sequences:
>1ctuA (A:) mhprfqtafaqladnlqsalepiladkyfpalltgeqvsslksatgldedalafallpla aacartplsnfnvgaiargvsgtwyfganmefigatmqqtvhaeqsaishawlsgekala aitvnytpcghcrqfmnelnsgldlrihlpgreahalrdylpdafgpkdleiktllmdeq dhgyaltgdalsqaaiaaanrshmpyskspsgvaleckdgrifsgsyaenaafnptlppl qgalillnlkgydypdiqravlaekadapliqwdatsatlkalgchsidrvlla