Chains and heterogens:
PDB Chain Sequences:
>1ur3M (M:) msyyhhhhhhlestslykkaglvqritiapqgpefsrfvmgywrlmdwnmsarqlvsfie ehldlgvttvdhadiyggyqceaafgealklaphlrermeivskcgiattareenvighy itdrdhiiksaeqslinlatdhldlllihrpdplmdadevadafkhlhqsgkvrhfgvsn ftpaqfallqsrlpftlatnqveispvhqpllldgtldqlqqlrvrpmawsclgggrlfn ddyfqplrdelavvaeelnagsieqvvnawvlrlpsqplpiigsgkiervraaveaetlk mtrqqwfrirkaalgydvp
>1ur3M (M:) lvqritiapqgpefsrfvmgywrlmdwnmsarqlvsfieehldlgvttvdhadiyggyqc eaafgealklaphlrermeivskcgiattareenvighyitdrdhiiksaeqslinlatd hldlllihrpdplmdadevadafkhlhqsgkvrhfgvsnftpaqfallqsrlpftlatnq veispvhqpllldgtldqlqqlrvrpmawsclgggrlfnddyfqplrdelavvaeelnag sieqvvnawvlrlpsqplpiigsgkiervraaveaetlkmtrqqwfrirkaalgydvp