Sex-specific microbial and tryptophan signatures of depression implicate archaeal methanogens and indole-3-acetic acid only in women. - Motger-Albertí A; Gallardo-Nuell L; Rosell-Díaz M; Stefoglo M; Pons J; Garre-Olmo J; Pérez-Brocal V; Moya A; Puig J; Ramos R; Mayneris-Perxachs J; Fernández-Real JM (NPJ biofilms and microbiomes, 2026)