1. Structural Biology Center, International Institute of Molecular and Cell Biology, 4 Trojdena St., 02-109 Warsaw, Poland
2. Laboratory of Protein Structure, International Institute of Molecular and Cell Biology, 4 Trojdena Street, 02-109 Warsaw, Poland
3. Ionis Pharmaceuticals, Inc., 2855 Gazelle Court, Carlsbad, California 92010, United States