Chains and heterogens:
PDB Chain Sequences:
>1t7tA (A:) gspgisgggggshiegyecqpiflnvleaiepgvvcaghdnnqpdsfaallsslnelger qlvhvvkwakalpgfrnlhvddqmaviqyswmglmvfamgwrsftnvnsrmlyfapdlvf neyrmhksrmysqcvrmrhlsqefgwlqitpqeflcmkalllfsiipvdglknqkffdel rmnyikeldriiackrknptscsrrfyqltklldsvqpiarelhqftfdllikshmvsvd fpemmaeiisvqvpkilsgkvkpiyfhtq
>1t7tA (A:) cqpiflnvleaiepgvvcaghdnnqpdsfaallsslnelgerqlvhvvkwakalpgfrnl hvddqmaviqyswmglmvfamgwrsftnvnsrmlyfapdlvfneyrmhksrmysqcvrmr hlsqefgwlqitpqeflcmkalllfsiipvdglknqkffdelrmnyikeldriiackrkn ptscsrrfyqltklldsvqpiarelhqftfdllikshmvsvdfpemmaeiisvqvpkils gkvkpiyfht