Genes must be expressed in a given number of cell with a certain level to be kept.
| min_cells | a integer indicating the minimal number of cells a gene must be expressed in. Default to 3. |
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| min_level | a numeric value indicating the minimal level of expression required. Default to 0. |
| verbose | a logical indicating whether to print the list of excluded genes. Default to FALSE. |
| data_status | character string. Specifies whether the gene expression levels used for calculation are raw ("Raw"), normalized ("Normalized") or have been imputed ("Smoothed"). Default to "Raw". |