Focusing on modules involved in the anti-tumor immune response, we see a module of the chemoattractants CCL19 and CCL21 concentrated in a narrow band at the tumor periphery, a module of MHC2 antigen presentation genes diffusing slightly beyond this band, and a module of MHC1 antigen presentation genes peaking in the same region but extending further yet into the tumor bed (Fig. 2c–e). Here, CCL21 is linked to neoplasm.