Chains and heterogens:
PDB Chain Sequences:
>1q4nX (X:) eyssntqqgrtsivhlfewrwvdialecerylapkgfggvqvsppnenvaihnpfrpwwe ryqpvsyklctrsgnedefrnmvtrcnnvgvriyvdavinhmcgnavsagtsstcgsyfn pgsrdfpavpysgwdfndgkcktgsgdienyndatqvrdcrlsglldlalgkdyvrskia eymnhlidigvagfridaskhmwpgdikaildklhnlnsnwfpegskpfiyqevidlgge pikssdyfgngrvtewkygaklgtvirkwngekmsylknwgegwgfmpsdralvfvdnhd nqrghgaggasiltfwdarlykmavgfmlahpygftrvmssyrwpryfengkdvndwvgp pndngvtkevtinpdttcgndwvcehrwrqirnmvnfrnvvdgqpftnwydngsnqvafg rgnrgfivfnnddwtfsltlqtglpagtycdvisgdkingnctgikiyvsddgkahfsis nsaedpfiaihaeskl