Copyright information:Taken from "tRNA-linked molecular beacons for imaging mRNAs in the cytoplasm of living cells"Nucleic Acids Research 2005;33(6):1902-1912.Published online 4 Apr 2005PMCID:PMC1074395.© The Author 2005. Published by Oxford University Press. All rights reserved tRNA labeled with TMR (red) and 75 kDa dextran (that cannot traverse nuclear pores) labeled with fluorescein (green) were co-injected into HeLa cells. () Component and composite images of a cell that received a nuclear injection. () Composite images of a field of cells which includes two cells that received a cytoplasmic injection.