calculate_mt_exprs: Calculate mitochondrial gene expression
In jacobheng/cellwrangler: Supplemental toolkit for single-cell RNAseq analysis

calculate_mt_exprs() calculates the expression of mitochondrial genes for a monocle CellDataSet object.

1	calculate_mt_exprs(cds, genome = "mouse", return_prop = T)

`cds`	monocle CellDataSet object
`genome`	genome to which transcripts are aligned to. Accepts either "mouse" or "human".
`return_prop`	logical; whether to return the value of mitochondrial transcripts as a proportion of total transcripts for each cell; resulting output will be the input CDS with the values of mt_RNAs and mt_prop attached to the corresponding pData. If FALSE, will only return the absolute number of transcripts per cell as a vector. Defaults to TRUE.