I have heard of staining (don't know if I'm using the right word) of a particular protein to enable for tracking. This new technique looks innovative. Kudos to people working on the field. I wish them good luck into unravelling more medical mystery and hopefully, one day, arrive on the cure for cancer.
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Staining isn't the right word, tracking is always done by some form of labeling. Depending on what you are tracking and where it is usually with a fluorescent molecule as I described above. If you are looking at cellular protein flux (ie production and breakdown of protein/or a substrate over time) then sometimes isotopic labeling can be employed (giving a cell an amino acid enriched with a heavy version of one of it's atoms like carbon 13 or nitrogen 15, or a heavy substrate molecule similarly labeled) and following things by mass spectrometry.
I have a feeling I may be wrong there, but thank you for clearing that up.
You weren't wrong, just not the term for what you were thinking of. :) Perhaps, slightly less right is the better way to think about it!
A little less right sounds much better :)
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