Node coloring does not support protein-level expression data

[dondi]

Node coloring is currently completely gene expression-centric. For now, the immediate task is to:

• Include a disclaimer that we are displaying gene expression (mRNA-level data) and not protein-level data (separated out into Disclaimer for lack of node-coloring PPI support #1071)

Eventually, we can explore to prospect of doing node coloring based on protein-level data

[dondi]

@ntran18 notes that this might be a matter of matching up node names when showing a PPI network because p is appended to the end and capitalization is different

[ntran18]

I'm able to make the node coloring appear for PPI if the user loads it from the database. However, the demos still have issue with displaying the node coloring, but I think it's the same root cause documented in #1053. If we can load the expression from the database for demos, then issue #1053 can be solved too.