FN1 and osteosarcoma: The low variation observed across measurements further suggests nearly complete and consistent surface coverage, comparable to FN and RGD coatings in previous studies.[37, 38] qPCR indicated high expression of integrins α5 and β1 subunits in MSCs and human foreskin fibroblasts (FFs), intermediate expression in human osteoblast (OBs) cells, and the lowest α5 and β1 expression in SaOS‐2 and MG‐63 osteosarcoma cell lines (Figure S9A, Supporting Information).