Fig. 7. Combined immunohistochemistry/FISH analysis on muscle-tissue sections of recipient female mice injected with donor male BM cells. Tissue sections were collected from samples harvested at 11 w (A), 19 w (B) and 34 w (C) after BMT. Samples (D) and (E) are muscles analyzed 18 w after transplantation and 2 w after cardiotoxin injury. (A-E) The green signal represents the expression of CD45.2 (donor-derived cells antigen). Nuclei are stained in blue by DAPI. Red dots within nuclei represent FISH hybridization using the Y-chromosome probe to confirm the donor-cell origin. (F) Immunohistochemistry using anti-CD45.2 (green) and anti-desmin (red) antibodies. A host-derived satellite cells (red) and a donor-derived CD45.2⁺ BM cell (green) that has migrated to the muscle are shown.