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Fig. 1. C/EBP{delta} is expressed in luminal epithelial cells. Immunohistochemistry of C/EBP{delta} in wild-type and C/EBP{delta} null mammary glands at the indicated time points of involution after 7 days of lactation. Representative sections at 400 x and 50 x original magnification are shown (insets). M, myoepithelial cells; solid arrows, positive stromal cells; open arrows, negative stromal cells.