Assertion: r phycoerythrin | /r/ObjectUse | used in fluorescence-based assays
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text: For example, R-phycoerythrin is a stable, soluble, negatively charged, and highly fluorescent red protein which is used in fluorescence-based assays and currently sold by Thermo Fisher Scientific Inc. for $105.50/mg (Cuellar-Bermudez et al. 2015; Thermo Fisher Scientific Inc. 2009, 2015).