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Expression of CTLA-4 in melanoma stem cells. (A) ALDH+ cells were identified in two melanoma cell lines by flow cytometry with the ALDEFLUOR kit. (B) ALDH+CTLA-4+ cells were identified in two melanoma cell lines by flow cytometry. CTLA-4, cytotoxic T lymphocyte antigen-4; ALDH, aldehyde dehydrogenase; DEAB, diethylaminobenzaldehyde.
