The 4T1 murine breast cancer cell line was purchased from ATCC. The B78-D14 cell line was derived from B16 melanoma and was obtained from Dr. Ralph Reisfield (Scripps Research Institute). The NXS2 cell murine neuroblastoma cell line was obtained from Dr. Alice Yu. B16 Tmem173 −/− CRISPR KO and corresponding wild type (WT) melanoma cells were obtained from Dr. Samuel Bakhoum (Memorial Sloan Kettering Cancer Center). Panc02 pancreatic cancer line was obtained from NCI. B78, 4T1, NXS2, Panc02, and B16 cells were grown in RPMI 1640 or DMEM (Mediatech) media and supplemented with 10% fetal bovine serum (FBS), 2 mM L- glutamine, 100 U/mL penicillin, and 100 μg/mL streptomycin. Cells were maintained in culture below 80% confluence for all passages, and early passages after thaw (3 (link)–8 (link)) were used for all experiments. Cell authentication was performed per ATCC guidelines using morphology, growth curves, and mycoplasma testing within 6 months of use.