Branched-chain amino acid specialization drove diversification within Calditenuaceae (Caldarchaeia) and enables their cultivation. - Lai D; Mosier D; Palmer M; Mayali X; Johnston J; Saldivar W; Covington JK; Jiao JY; Murali R; Seymour CO; Liu L; Hua ZS; et al. (Nature communications, 2026)