Chains and heterogens:
PDB Chain Sequences:
>1mrqA (A:) qdskyqcvklndghfmpvlgfgtyapaevpkskaleatklaieagfrhidsahlynneeq vglairskiadgsvkredifytsklwcnshrpelvrpalerslknlqldyvdlylihfpv svkpgeevipkdengkilfdtvdlcatweavekckdaglaksigvsnfnrrqlemilnkp glkykpvcnqvechpyfnqrklldfckskdivlvaysalgshreepwvdpnspvlledpv lcalakkhkrtpalialryqlqrgvvvlaksyneqrirqnvqvfefqltseemkaidgln rnvryltldifagppnypfsdey