AXL and cancer: To detect the C-mannosylation of AXL in other cell lines, we established AXL-ECD-overexpressing cells, purified recombinant AXL-ECD, and performed LC–MS/MS analysis in 3 cancer cell lines: human NSCLC PC9 and H3122 and human fibrosarcoma HT1080 (Fig. 3A-C, Fig. S1).