Detection of breast cancer cells. CD34-selected cells were either stained with a CD3 MoAb (A), CD34 (B), or MoAb A45 anti-pancytokeratin (C). One CD3⁺ T cell can be detected in (A). All cells within the magnification field are CD34⁺ (B). Using pancytokeratin antibody A45, a breast cancer cell can be recognized in (C).