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Rare Sox9EGFP-positive BECs do not express SOX9 protein. (A) SOX9 is expressed in most, but not all, Sox9EGFP+ cells (arrowheads indicate EGFP+/SOX9–) (scale bar = 50 μm; ∗ indicates P < .05, one-way analysis of variance and Tukey test). (B) Co-localization of SOX9 with EPCAM independently confirms the presence and occurrence of SOX9- BECs (left lobe, arrowheads indicate EPCAM+/SOX9– cells, scale bars = 50 μm).
