Figure 2From: Clinical instability of breast cancer markers is reflected in long-term in vitro estrogen deprivation studies Characterization of ER and PR expression by ICC at selected time points . (A) ER expression in MCF7 cells. Cells stained brown are positive for the receptor. (B) PR expression in MCF7 cells (C) ER expression in BT474 cells (D) PR expression in BT474 cells. Original magnification 40×.Back to article page