Seurat: use ScaleData only once to avoid possibly overwriting 
Seurat: use ScaleData only once to avoid possibly overwriting 


Scaling needs to be done twice however, as Object@scale.data is needed
by the RunPCA function, and we want to print the plots before and after
cell cycle scaling.
chipster/chipster-tools,chipster/chipster-tools,chipster/chipster-tools,chipster/chipster-tools