Feeder-independent E14 and R1 mES cells were cultured in 2i medium [1], a serum-free N2B27 medium supplemented with MEK inhibitor PD0325901 (1 μM) and GSK3 inhibitor CHIR99021 (3 μM) (both from Selleckchem), and 1000 U/ml LIF (Millipore). TrypLE™ Express (Life Technologies) was used to passage the cells. To ensure good adherence 2 % ES-qualified FBS was supplemented to the 2i media when seeding the cells, as previously described [2].
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