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Minimal Essential Medium (MEM; contains Earle’s salts) (GIBCO/Invitrogen 11095-080)
0.001% ovalbumin (Sigma)
25 ng/mL insulin (Sigma)
1 mg/mL transferrin (Sigma)
10 mM sodium pyruvate (Sigma)
2 ppm progesterone (Sigma)
3 ppm selenium dioxide (SeO2) (Sigma)
0.5 nM putrescine (Sigma)
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