Figure 7. Airway-retained GFP⁺Ccsp⁺ donor cells express epithelial-specific K18 protein.

(A–E) Staining controls for GFP, Ccsp, and K18. (F and G) Representative experimental group in which Ccsp knockout recipients received bone marrow transplant of Ccsp⁺GFP⁺ BMCs (EXP lung) and showed coexpression of GFP, Ccsp, and K18 under low-power magnification (F) and high-power magnification (G). White arrows point to GFP⁺Ccsp⁺K18⁺ cells, green arrows point to GFP⁺Ccsp^–K18^– cells, red arrows point to GFP⁺Ccsp^–K18⁺ cells, blue arrows point to GFP⁺Ccsp⁺K18^– cells. Scale bars: 20 μm. Original magnification, ×60. Asterisks indicate GFP^–Ccsp⁺K18⁺ epithelium. n = 4 per group.