Compared with tumor grafts (TMM1, TMM7, or TMM9), TMM6 showed faster tumor growth (Figure 3M), evident IDO1 expression (Figure 3N), a lower relative Trp concentration (Figure 3O), higher relative [Kyn]/[Trp] ratio (Figure 3P), as well as a lower CD8+T proportion (Figure 3Q). The gene discussed is IDO1; the disease is neoplasm.