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Correlation of expression levels between PD-1, CTLA4 and LAG3 in CB. (A) PD-1 and CTLA-4; (B) PD-1 and LAG-3; (C) CTLA-4 and LAG-3. PD-1, programmed death-1; CTLA-4, cytotoxic T lymphocyte antigen-4; LAG-3, lymphocyte activation gene-3; CB, cord blood.
