Odd-looking cell cycle scores in scRNA-seq data

Question

[Igor]

I've performed the cell cycle scoring using the scanpy workflow. When I visualise the phase I get the following plot:

It seems that some cells have a vastly differing profile from the rest. Because of this, I can't really tell if the majority of the cells are separable by the first two PCs. I haven't seen that many cell cycle scores before, does it look atypical? How would you go about investigating this?

[firestar]

The phases doesn't look too unusual to me. Even the PCA might be ok. Look into tSNE or UMAP and colour points by other QC metrics like number of UMIs, number of features, percentage mitochondrial expression etc.