Despite the apparent tissue damage (Fig. 1 and SI Appendix, Fig. S1A), serum levels of alanine aminotransferase (ALT), aspartate aminotransferase (AST), and alkaline phosphatase (ALP), enzymes which are often elevated in serum following acute liver damage (18), were not increased in animals that possessed abscesses (SI Appendix, Fig. S1B). The gene discussed is GPT; the disease is abscess.