An ultra-faint, chemically primitive galaxy forming in the reionization era - Kimihiko Nakajima; Masami Ouchi; Yuichi Harikane; Eros Vanzella; Yoshiaki Ono; Yuki Isobe; Moka Nishigaki; Takuji Tsujimoto; Fumitaka Nakamura; Yi Xu; Hiroya Umeda; Yechi Zhang (Nature, 2026)