Chains and heterogens:
PDB Chain Sequences:
>1l7iH (H:) evqlvesggglvqpggslrlscaasgftftdytmdwvrqapgkglewvadvnpnsggsiy nqrfkgrftlsvdrskntlylqmnslraedtavyycarnlgpsfyfdywgqgtlvtvssa stkgpsvfplapsskstsggtaalgclvkdyfpepvtvswnsgaltsgvhtfpavlqssg lyslssvvtvpssslgtqtyicnvnhkpsntkvdkkvepksc
>1l7iL (L:) diqmtqspsslsasvgdrvtitckasqdvsigvawyqqkpgkapklliysasyrytgvps rfsgsgsgtdftltisslqpedfatyycqqyyiypytfgqgtkveikrtvaapsvfifpp sdeqlksgtasvvcllnnfypreakvqwkvdnalqsgnsqesvteqdskdstyslsstlt lskadyekhkvyacevthqglsspvtksfnrgec