The free-living wellspring of symbiotic nitrogen fixation in Bradyrhizobium - Lu Ling; Sishuo Wang; Jinjin Tao; Marjorie Pervent; Kaitlyn E. Ho; Coline Sciallano; Alicia Camuel; Nico Nouwen; Eric Giraud; Haiwei Luo (Proceedings of the National Academy of Sciences, 2026)