Biology · Immunology

Strain A mice were crossed with strain B mice to obtain F1 generation mice, i.e., (A × B)F1. A scientist implanted thymectomized and irradiated (A × B)F1 mice with a B-type thymus, and then reconstituted the immune system with an intravenous infusion of (A × B)F1 bone marrow cells. These chimeric mice were infected with lymphocytic choriomeningitis virus (LCMV), and the spleen T cells were tested for their ability to kill LCMV-infected target cells from strain A or strain B mice. Which one of the following is the correct outcome?