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Substances that mediate the import of proteins into cells, "carriers", have many potential applications. The most potentially useful carriers do not have to be covalently linked to their protein cargoes. However, a common problem with all carrier molecules is that they tend to deposit the cargo proteins into endosomes; diffuse distribution in the cytosol is the desired outcome. This paper describes the import of four different labeled (Alexa Fluor R 488) proteins (avidin, recombinantdoi:10.1039/b809006h pmid:19039359 fatcat:3yf5jiyajjckppg3c6t34yhhpq