Chains and heterogens:
PDB Chain Sequences:
>1tm2A (A:) gsaeriafipklvgvgfftsggngaqeagkalgidvtydgptepsvsgqvqlvnnfvnqg ydaiivsavspdglcpalkramqrgvkiltwdsdtkpecrsyyinqgtpkqlgsmlvema ahqvdkekakvaffyssptvtdqnqwvkeakakisqehpgweivttqfgyndatkslqta egiikaypdldaiiapdanalpaaaqaaenlkrnnlaivgfstpnvmrpyvqrgtvkefg lwdvvqqgkisvyvanallknmpmnvgdsldipgigkvtvspnseqgyhyeakgngivll pervifnkdnidkydf
>1tm2A (A:) aeriafipklvgvgfftsggngaqeagkalgidvtydgptepsvsgqvqlvnnfvnqgyd aiivsavspdglcpalkramqrgvkiltwdsdtkpecrsyyinqgtpkqlgsmlvemaah qvdkekakvaffyssptvtdqnqwvkeakakisqehpgweivttqfgyndatkslqtaeg iikaypdldaiiapdanalpaaaqaaenlkrnnlaivgfstpnvmrpyvqrgtvkefglw dvvqqgkisvyvanallknmpmnvgdsldipgigkvtvspnseqgyhyeakgngivllpe rvifnkdnidkydf