A fluorescent tag, commonly referred to as a label or probe, is a fluorophore that may be used to determine the distribution and quantity of a target biomolecule.
A genetically encoded probe for imaging nascent and mature HA-tagged proteins in vivo
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Green Fluorescent Protein: Its Development, Protein Engineering, and Applications in Protein Research — Journal of Young Investigators
A Bright Monomeric Near-Infrared Fluorescent Protein with an Excitation Peak at 633 nm for Labeling Cellular Protein and Reporting Protein–Protein Interaction
Fluorescence imaging of drug target proteins using chemical probes - ScienceDirect
An Overview of Fluorescent Protein Tags
Absolute protein quantification using fluorescence measurements with FPCountR
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Fluorescent protein tags
Green Fluorescent Protein - an overview