Similar to CD8+ T cells, IgY-containing cells were also localized in the stroma (normal ovaries or ovaries with tumor) as well as in the theca of stromal follicles in normal hens and in the nests of the tumor (intratumoral infiltration) in OVCA hens at early and late stages (Figures 5(a)–5(c)). The gene discussed is CD8A; the disease is neoplasm.