At 24 h after photoconversion ∼25% of CD8 T cells, CD4 T cells, regulatory T cells (Treg), and natural killer (NK) cells were Kaede Green+, and this proportion increased over time such that by 120 h, the majority of all TILs had entered the tumor since labeling (Figs. 1 C and S1 B). Here, CD4 is linked to neoplasm.