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2 protocols using cts knockout sr xenofree medium

1

Isolation and Culture of iPSC-O Cells

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Human cells were isolated from surplus liver tissue of a one-year-old girl with fulminant hepatitis (Hep2064). Primary cells were isolated according to the collagenase perfusion method25 (link),29 (link),30 (link). iPSC-O cells were generated by introduction of Sendai virus carrying the 4 Yamanaka factors31 (link). The iPSC-O cells were cultured on MEFs and grown using a medium for human ES cells [KNOCKOUT DMEM (Gibco, 10829), 15% CTS KNOCKOUT SR XenoFree Medium (Gibco, 14150), 1% penicillin streptomycin (Gibco, 11140), 1% non-essential amino acids (Gibco, 11360), 1% Sodium Pyruvate (Gibco, 11360), 1% Gulta MAX (Gibco, 35050), 0.1% β-mercaptoethanol (Gibco, 21985-023), and 10.0 ng/ml bFGF (INVITROGEN, PHG0024)].
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2

Cryopreservation of Stem Cells

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The cells were rinsed with phosphate-buffered saline (PBS, Gibco), non-enzymatically passaged by 0.5 mM of EDTA (Invitrogen), and spined for 4 min/300 g. Cells (0.5 × 106/mL) were resuspended in cold freezing medium consisting of 65% NutriStem® hPSC XF Medium (Biological Industries), 25% CTS Knockout SR XenoFree Medium (Gibco), and 10% CryoSure-DMSO (WAK chemie) supplemented with 10 µM ROCK inhibitor and frozen in cryotubes (Nunc) placed in Corning CoolCell Freezing container at the rate of -1 °C/minute in −80°C freezer. cryotubes were moved to nitrogen vapors (− 196 °C) after 24 h.
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