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H&E staining of tumors harvested at the termination of the experiment. A) High lymphocytic infiltration was found in one (3223) of the E1 peptide-TT helper immunized rabbits; B) Low lymphocytic infiltration was found in persistent tumors as shown here from one (3224) of the control group (10×); C) A malignant tumor (early cancer) was found from one (3211) of the control group rabbits (10×).
