Chains and heterogens:
PDB Chain Sequences:
>1r3lA (A:) dilltqspailsvspgervsfscrasqsigtdihwyqqrtngsprllikyasesisgips rfsgsgsgtdftlsinsvesedianyycqqsnrwpftfgsgtkleikradaaptvsifpp sseqltsggasvvcflnnfypkdinvkwkidgserqngvlnswtdqdskdstysmsstlt ltkdeyerhnsytceathktstspivksfnrn
>1r3lB (B:) qvqlqqpgaelvkpgasvklsckasgytftsdwihwvkqrpghglewigeiipsygrany nekiqkkatltadkssstafmqlssltsedsavyycarergdgyfavwgagttvtvssak ttppsvyplapgsaaqtnsmvtlgclvkgyfpepvtvtwnsgslssgvhtfpavlqsdly tlsssvtvpssswpsetvtcnvahpasstkvdkkivprd
>1r3lC (C:) mapmlsgllarlvklllgrhgsalhwraagaatvllvivllagsylavlaergapgaqli typralwwsvetattvgygdlypvtlwgrcvavvvmvagitsfglvtaalatwfvgreqe rrgh
>1r3lC (C:) salhwraagaatvllvivllagsylavlaergapgaqlitypralwwsvetattvgygdl ypvtlwgrcvavvvmvagitsfglvtaalatwfvgreqerrgh