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Clear cell renal cell carcinoma with negative HIF-2α expression (A) and positive HIF-1α expression (B) (×400). Reproduced under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/, accessed on 18 October 2021) (reference: https://doi.org/10.1186/s13000-018-0742-8).
