In young animals, all 5 immune system proteins S100A9 (C3S7K6), uncharacterized Heme peroxidase (F1RRP1), LTF (Q6YT39), uncharacterized Cathelicidin (I3LNT1) and PGLYRP1 (F1RM24) were under-represented in TB+ animals when compared to uninfected TB- controls (Fig 4A and 4B). The gene discussed is S100A9; the disease is tuberculosis.