Is tryptophan catabolism increased under indoleamine 2,3 dioxygenase activity during chronic lung inflammation in pigs? Delphine Melchior, Nadine Mézière, Bernard Sève and Nathalie Le Floc’h Reprod. Nutr. Dev., 45 2 (2005) 175-183 DOI: 10.1051/rnd:2005013