pmCherry-C1 is a mammalian expression vector designed to express a protein of interest fused to the C-terminus of mCherry, a mutant fuorescent protein derived from the tetrameric Discosoma sp. red fuorescent protein, DsRed (1). The excitation and emission maxima of the native mCherry protein are 587 nm and 610 nm, respectively. Expression of fusion proteins that retain the fuorescent properties of the unmodifed mCherry protein can be monitored by fow cytometry and their localization in vivo can be determined by fuorescence microscopy.