Figure 4.

Localization and expression levels of collagen fibrils, CD13, Tenascin-C, and CD26 in intralobular and interlobular normal human breast stroma. A. Tissues were stained with Sirius Red alone (top panel) or with Fast Green counterstain (bottom panel). B. RT-PCR analysis of the indicated genes expression. C. Mean ± SD gained by densitometric examination of RT-PCR product from three independent samples. D. Tissues were subjected to immunohistochemical analysis with the specific antibody indicated (left panels) or corresponding negative controls (right panels). Note large quantities of intensely stained interlobular stroma (asterisks) compared to the paler-staining intralobular stroma (arrow). Scale bar = 200 μM.