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Normal prelactating mammary gland in a mid-pregnant FVB female stained using the immunoperoxidase technique to identify cytokeratin. Note that the luminal cells of the collecting ducts have the heaviest red-brown cytoplasmic stain. Some myoepithelial stain is also present in the developing alveoli. The primary antibody is AE1/AE3, a monoclonal mouse antibody against high and low molecular weight cytokeratin. The MOM technique was used.
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