1. DNA Damage Formation and p53 Accumulation in Mammalian Cells Exposed to the Space Environment.
   Takeo Ohnishi et al, 1999, Biol. Sci. Space CrossRef
2. Expression of p53-Regulated Genes in Cultured Mammalian Cells After Exposure to A Space Environment
   Takeo Ohnishi et al, 2009, Biol. Sci. Space CrossRef