Often we would like to correct for expression variation in our analysis due to phenomena unrelated to our focus of study. Such unwanted effects can include cell-cycle variability or differences in mitochondrial expression.
Rather than simply excluding count values attributable to a given process, it is better to adjust the expression of all remaining genes or transcripts in each cell based on the sum score of relevant genes, to regress out cell-cycle effects, for example
Such regression can be performed for any arbitrary gene set. Some preset gene lists are included in seuratTools
including cell-cycle, mitochondrial, and apoptotsis related gene sets.
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