FAP and colorectal carcinoma: We revealed a greater and more widespread signal for FAPα in both the fibroblasts and HCT-116 cells in the 3D CRC μTs (Figure 7H,I, white arrows for fibroblasts; yellow arrows for HCT-116 cells) when compared to the 3D Stroma μTs, in which the FAPα signal was displayed in the fibroblast cytoplasm, particularly centered around the nucleus (Figure 7K,L, white arrows).