This study, as well as other in vitro cytokine release studies, shows considerable variation in the absolute values of the secreted protein for both control and treated conditions, and this cell culture variation confounds interpretation of results.
Such variability can be introduced at multiple different levels including generation of stem cell lines, continuous in vitro culture, variation in cell culture reagents, differential efficiencies of neural generation and genetic background.
This allowed direct gene-by-gene comparisons with much higher confidence disregarding culture to culture variations and thereby identification of discordant behaviors among individual genes.
While it is formally possible that culture variations in the first few weeks of hESC derivation and expansion may yield XCI variation, we cannot rule out the alternative possibility that XCI variations may reflect innate heterogeneity of the original cells found in the ICM of the human embryo.
To clarify these important differences and to detail our experience with this culture technique, we outline the broad applicability of our CPC generation method, describe the effects of culture variations on phenotype, and use lineage tracing explore the origin of these promising therapeutic cells.
In this scenario it would be unsurprising that distinct ITS1-types respond differently to culture variations.
Such geographical differences could be due to culture, variations in prenatal care assistance or access to medications in the various regions and the related costs.
The concept of clinical excellence, in contrast, acknowledges that health professionals (at all levels of intervention and in all settings) must consider issues of local culture, variations in resource availability, and determinants of health in order to provide optimum care.
However, evaluations of these efforts showed some mixed results, pointing out various barriers to implementation, including personnel transfers, police culture, variations in public perception of the role of police, and ongoing police corruption [ 2, 39, 40].
The culture-to-culture variation of the parameters was smaller.
Given the level of typical inter-culture variation in gene expression, it is plausible that there is no specific response to Tf as an iron donor, which is consistent with its wide distribution within the host.
