Mouse sorted cells at 1 × 103 were transferred to non-adherent 24 well plates (Corning) with spheroid-forming media5 (link), 7 (link), 47 (link) [1:2 ratio of DMEM F12 (Gibco) and Human Endothelial Medium (Gibco) supplemented with 3.75% Chicken Extract (US Biological), 0.1 mM β-ME (Invitrogen), 1% Non-essential amino acids (Gibco), 1% Pen-strep (Gibco), 1% N2 (Gibco), 2% B27 (Gibco), 20 ng/mL human bFGF (R&D Systems), 20 ng/mL mouse PDGF (Peprotech), 20 ng/mL mouse oncostatin M (R&D Systems), 20 ng/mL mouse IGF-1 (Peprotech), 20 ng/mL mouse EGF (Peprotech)]. After 7 days, the spheroid efficiency was determined.
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