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