Cultivation of primate embryonic stem cells
a technology of embryonic stem cells and primate embryos, which is applied in the field of primate embryonic stem cell culture to achieve the effects of avoiding the variability of results due to differences in animal serum batches, avoiding the use of animal serum, and increasing the efficiency of cloning
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[0031] In the first experiments described here human ES cells were plated on irradiated (35 gray gamma irradiation) mouse embryonic fibroblasts. Culture medium for the present work consisted of 80% “KnockOut” Dulbeco's modified Eagle's medium (DMEM) (Gibco BRL, Rockville, Md.), 1 mM L-Glutamine, 0.1 mM β-mercaptoethanol, and 1% nonessential amino acids stock (Gibco BRL, Rockville, Md.), supplemented with either 20% fetal bovine serum (HyClone, Logan, Utah) or 20% KnockOut SR, a serum-free replacement originally optimized for mouse ES cells (Gibco BRL, Rockville, Md.). The components of KnockOut SR are those described for serum replacements in WO 98 / 30679.
[0032] In alternative experiments medium was supplemented with either serum or the aforesaid serum replacer KnockOut SR, and either with or without human recombinant basic fibroblast growth factor (bFGF, 4 ng / ml). The preferred concentration range of bFGF in the culture was between 0.1 ng / ml to 500 ng / ml.
[0033] To determine clonin...
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