TagCFP is a cyan monomeric protein generated on the basis of the wild-type GFP-like protein from jellyfish Aequorea macrodactyla [Xia et al., 2002]. It possesses bright fluorescence with excitation/emission maxima at 458 and 480 nm, respectively. TagCFP is significantly brighter than commonly used ECFP.

TagCFP is mainly intended for protein labeling in protein localization and interaction studies. It can also be used for cell and organelle labeling and for tracking the promoter activity.