FGFR2 expression in normal human and mouse MGs detected by immunohistochemistry. (A) In human MG, FGFR2 is expressed in the acini (a), ductules (d), and central duct (D). In the peripheral MG acinus, FGFR2 immunoreactivity was detected in both the cell membrane and nuclei of basal epithelial cells (black arrow) and in newly differentiated meibocytes (white arrow). (B) In mouse MG, the FGFR2 expression pattern was similar to that seen in human MG (A). Scale bars denote 100 μm.