Paralogs can be defined as related genes within a genome that are thought to arise from gene duplication events. Because paralogous proteins share amino acid identity, they can have redundant functions. But the picture is not necessarily so straightforward. Indeed, there are examples in which paralogous genes have distinct functions in some tissues, and overlapping functions in others.
The DRSC/TRiP is engaged in a project in collaboration with the Perrimon and Bellen labs to generate resources useful for the study of paralogous genes in Drosophila.