FOXP3 and neoplasm: Here, several types of FP transgenic C57BL/6 mice were used to represent the host immunocytes: Foxp3+ regulatory T cells were labeled with red FP (mRFP), endogenous tumor-infiltrating lymphocytes were labeled with green FP (GFP), CD11c+ dendritic cells were labeled with yellow FP (YFP), and tumor-infiltrating immunocytes (TIIs) were labeled with enhanced green FP (EGFP).