Chains and heterogens:
PDB Chain Sequences:
>1bsfA (A:) tqfdkqynsiikdiinngisdeefdvatkwdsdgtpahtlsviskqmrfdnsevpilttk kvawktaikellwiwqlksndvndlnmmgvhiwdqwkqedgtighaygfqlgkknrslng ekvdqvdyllhqlknnpssrrhitmlwnpdeldamaltpcvyetqwyvkhgklhlevrar sndmalgnpfnvfqynvlqrmiaqvtgyelgeyifnigdchvytrhidnlkiqmereqfe apelwinpevkdfydftiddfklinykhgdkllfevav
>1bsfA (A:) tqfdkqynsiikdiinngisdeefdvrtkwdsdgtpahtlsviskqmrfdnsevpilttk kvawktaikellwiwqlksndvndlnmmgvhiwdqwkqedgtighaygfqlgkknrslng ekvdqvdyllhqlknnpssrrhitmlwnpdeldamaltpcvyetqwyvkhgklhlevrar sndmalgnpfnvfqynvlqrmiaqvtgyelgeyifnigdchvytrhidnlkiqmereqfe apelwinpevkdfydftiddfklinykhgdkllfevav
>1bsfB (B:) tqfdkqynsiikdiinngisdeefdvatkwdsdgtpahtlsviskqmrfdnsevpilttk kvawktaikellwiwqlksndvndlnmmgvhiwdqwkqedgtighaygfqlgkknrslng ekvdqvdyllhqlknnpssrrhitmlwnpdeldamaltpcvyetqwyvkhgklhlevrar sndmalgnpfnvfqynvlqrmiaqvtgyelgeyifnigdchvytrhidnlkiqmereqfe apelwinpevkdfydftiddfklinykhgdkllfevav
>1bsfB (B:) tqfdkqynsiikdiinngisdeefdvrtkwdsdgtpahtlsviskqmrfdnsevpilttk kvawktaikellwiwqlksndvndlnmmgvhiwdqwkqedgtighaygfqlgkknrslng ekvdqvdyllhqlknnpssrrhitmlwnpdeldamaltpcvyetqwyvkhgklhlevrar sndmalgnpfnvfqynvlqrmiaqvtgyelgeyifnigdchvytrhidnlkiqmereqfe apelwinpevkdfydftiddfklinykhgdkllfevav