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Immunohistochemical localization of RARγ in the tumor areas of samples from patients with different stages of CRC. (A) Stage I, (B) stage II, (C) stage III and (D) stage IV. Immunohistochemical staining was carried out on paraffin-embedded sections (4-μm thick) using a primary antibody against RARα (1:150) and the Envision system as the secondary antibody. Original magnification, ×200.
