Histologic examination of other tissues in affected animals. Hematoxylin (A,C,E,G) and Giemsa (B,D,F,H) stains of various tissues from affected animals. (A-B) Subcutaneous tumor in the skin. (C-D) Widespread infiltration of the lung. (E-F) Mast cell tumor in thymus. (G-H) Small, widespread infiltrates in the liver. Infiltrates were also seen in the kidney and lymph nodes of some animals (data not shown). Original magnification, × 10 in all panels.