Chains and heterogens:
PDB Chain Sequences:
>1bz7A (A:) diqmtqitsslsvslgdrviiscrasqdignflnwyqqkpdgslklliyytsrlqsgvps rfsgwgsgtdysltisnleeediatffcqqgktlpytfgggtkleikrtvaapsvfifpp sdeqlksgtasvvcllnnfypreakvqwkvdnalqsgnsqesvteqdskdstyslsstlt lskadyekhkvyacevthqglsspvt
>1bz7B (B:) dvqlvesggglvqpggsrklscaasgftfsnfgmhwvrqapekglewvayissggssiny adtvkgrftisrdnpkntlflqmtslrsedtaiyyctrggtgtrslyyfdywgqgatliv ssastkgpsvfplapsskstsggtaalgclvkdyfpepvtvswnsgaltsgvhtfpavlq sglyslssvvtvpssslgtqtyicnvnhkpsntkvdk