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C4‐2 tumor cell proliferation and effects of digoxin. C4‐2 cell xenograft tumors were excised after 7 days of treatment with digoxin or control. Two hours prior to sacrifice, mice were injected with BrdU labeling reagent and stained for BrdU. Photomicrographs are representative of both control‐ and digoxin‐treated tissue with five mice each.
