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