FN1 and central nervous system cancer: Compared to U87 glioma cells, FAP+ pericyte‐like cells and HBVP had 15–44 times higher abundance of collagen alpha‐1(I) chain, 16–31 times higher abundance of collagen alpha‐2(I) chain proteins, and 21–68 times higher abundance of FN1 (Figure 4E).