Additional information Accession codes: The atomic coordinates and structure factor amplitudes have been deposited with the Protein Data Bank (http://www.pdb.org; PDB ID codes are— 4AOH for hA... G atomic resolution structure; 4AHD , 4AHE , 4AHF , 4AHG , 4AHH , 4AHI , 4AHJ , 4AHK , 4AHL , 4AHM , 4AHN for Q12L , K17E , K17I , S28N , R31K , K40I , I46V , K54E , P112L , V113I , R121H for hANG-ALS variants, respectively).