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Abstract

The invention provides new methods for screening libraries of peptides and other compounds for a desired property in eucaryotic cells. The methods are premised, in part, on the unexpected observation that the contents of procaryotic or lower eucaryotic cells, such as yeast, can be transferred to recipient eucaryotic cells in an essentially clonal manner by protoplast fusion of the respective cells. Applications of the methods include screening peptides in eucaryotic cells substantially incapable of episomal replication of transferred nucleic acid fragments; screening in eucaryotic cells peptides or secondary metabolites produced in procaryotic cells; and screening a library of peptides for capacity to bind a selected RNA in eucaryotic cells.

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First Claim