Tissue infiltration of K-RASG12D–expressing myeloid cells. Hematoxylin and eosin–stained sections of tissues from Rce1fl/+KLSLM (left) and Rce1fl/flKLSLM mice (right) harvested 5 weeks after pI-pC injections. (A-B) Bone marrow. (C-D) Spleen. (E-F) Liver. (G-H) Lung. Magnification: 63×/1.40 (A,B); 20×/0.50 (C-H).