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Expression levels of HHLA2 in different tumors; (A) Expression level of HHLA2 in SKCM; (B) Expression levels of HHLA2 in SKCM at different TNM stages; (C) Expression levels of HHLA2 in 33 types of cancers. ‘*’ stands for P < 0.01, ‘**’ stands for P < 0.001, ‘***’ stands for P < 0.0001. Ns, no significance.
