Also disclosed are polynucleotides encoding the MTD peptides, methods of identifying the MTD peptides; {HEAD ~ methods} of genetically engineering a biologically active molecule to have cell permeability by using the MTD peptides, {TAIL ~ methods} of importing a biologically active molecule into a cell by using the MTD peptides, and uses thereof 
Also disclosed are polynucleotides encoding the MTD peptides , methods of identifying the MTD peptides ; { HEAD ~ methods } of genetically engineering a biologically active molecule to have cell permeability by using the MTD peptides , { TAIL ~ methods } of importing a biologically active molecule into a cell by using the MTD peptides , and uses thereof
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