Table 2.

ERα and SRC-1 immunoreactive cells on dual fluorescent labeling in the epithelium of mammary gland in 3-week-old female rats

Region	ERα-positive/SRC-1-negative	ERα-negative/SRC-1-positive	ERα-positive/SRC-1-positive	ERα-negative/SRC-1-negative
Main duct	26.62  ±  5.85	37.12  ±  4.05	1.44  ±  0.67	34.82  ±  9.22
Small duct	34.82  ±  2.81	33.17  ±  4.04	1.64  ±  0.59	28.13  ±  4.28
End bud	34.60  ±  2.49	17.31  ±  2.44	1.31  ±  0.25	45.84  ±  2.54

Cells expressing immunoreactive ERα, SRC-1, or both were counted from various regions (end buds, small ducts, and main ducts) of the mammary glands as indicated in Fig. 2A. Values are mean percentages of positive nuclei (±SD), with four animals in each group. A total of 2,183 cells from 4 main ducts, 3,911 cells from 19 small ducts, and 4,274 cells from 18 end buds was counted.