The src protein was undetectable in the liver specimens from HBx and HBx(p53-) fish aged 1.5 to 9 months that appeared normal (Figure 5B1~B3, C1~C3), as well as in the liver sections from fish aged 11 months that had only developed steatosis (Figure 5B4) or chronic inflammation (Figure 5C4). The gene discussed is TP53; the disease is steatosis.