iRFP is a sensitive marker for cell number and tumor growth in high-throughput systems.

Hock AK, Lee P, Maddocks OD, Mason SM, Blyth K, Vousden KH
Cell Cycle. 2014;13(2):220-6. doi: 10.4161/cc.26985. Epub 2013 Oct 31. PubMed Article

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