Before getting a shot to make an NFL roster the player must spend several years as an unpaid intern -- called college football, aka the NFL's cost-free feeder system.
Because some LIF is produced endogenously by iMEFs, we evaluated the expression of a subset of Stat3 ChIP-chip targets in serum-free, feeder-free, and LIF-independent conditions over a time-course of 5 days using Q-RT-PCR.
In 2005, Ikeda et al 18 conducted a protocol by which retinal precursors could be directly differentiated from mouse ESCs by supplementing Dkk1 and LeftyA under serum-free, feeder-free conditions; 16% of the total cells could be differentiated into retinal precursor cells (Rax positive).
To prepare for ESMV collection, ESCs were expanded under serum-free and feeder-free conditions.
Undifferentiated human iPSCs (IMR90, WiCell Research Institute, Madison, Wisconsin, USA) were maintained in a serum-free and feeder-free culture system (StemPro hESC SFM system) (Invitrogen Gibco) according to the manufacture's instructions.
Intensive efforts are ongoing to develop iPSCs using FBS-free media, feeder-free cultivation, and integration-free reprogramming, and numerous modifications are required to the protocol used for differentiation from iPSCs [ 27].
Serum-free and feeder-free microcarrier platforms are available for hPSC-based processing, although many of these utilise the microcarrier coating, Matrigel, which is derived from murine origins [ 25].
Importantly for clinical applications, this method was serum-free and feeder-free, and was highly permissive for definitive erythropoiesis, yielding CD235a+ erythroblasts that were predominantly HbF+, and that co-expressed both HbF+ and HbA+ (44·0 ± 6·04%).
Under serum-free and feeder-free conditions, within 1 to 2 weeks after viral vector infection, small reprogrammed colonies, characterized by a sharp-edged, flat, tightly-packed morphology, were apparent.
In a serum-free and feeder-free floating aggregate culture, Osakada et al 58 found that ESCs and iPSCs could be efficiently differentiated into RPE cells by supplementing CKI-7 (a Wnt antagonist) and SB-431542 (a nodal antagonist).
