Tryptophan Feeding of the IDO1-AhR Axis in Host–Microbial Symbiosis - Zelante, Teresa; Iannitti, Rossana Giulietta; Fallarino, Francesca; Gargaro, Marco; De Luca, Antonella; Moretti, Silvia; Bartoli, Andrea; Romani, Luigina (Frontiers in Immunology, 2014)