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Effect of ascorbate on 4T1 breast tumor growth in gulo KO mice: H&E stains of tumors of groups. Gulo KO−, ascorbate deprived; gulo KO+, ascorbate supplemented. (A) Scorbutic gulo KO mouse; (B) ascorbate supplemented gulo KO mouse; (C) wild-type mouse; magnification, ×2.
