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HH inhibition does not alter the proliferative index of Pdgfra-expressing cells. PdgfraEGFP/+ lungs from mice treated with 5E1 or IgG control at E18.5 were harvested at P8 and stained for GFP (red) and Ki67 (green). Nuclei are stained with DAPI (blue). Data are normalized mean ± SD. P values <0.05 (t test) indicate statistical significance; scale bar, 100 μm.
