Figure 6.

Colocalization of PCNA with ERα or ERβ. Mammary gland sections from 6-week-old (A and C) and pregnancy day 7 (B and D) female rats were doubly stained with antibodies to PCNA (PC10) and ERα (MC20) (A and B) or to PCNA (PC10) and ERβ (503) (C and D). In A and B, green nuclei indicate cells expressing ERα and red nuclei indicate those containing PCNA. In C and D, green nuclei contain PCNA and red nuclei contain ERβ. The yellow nuclei, some of them marked with arrowheads, indicate coexpression of receptor and PCNA. (Bars = 50 μm.)