The cosmopolitan microcrustacean Daphnia pulex provides a model system for both human health research and monitoring ecosystem integrity. It is the first crustacean to have its complete genome sequenced, an unprecedented ca. 36% of which has no known homologs with any other species. | Targeted gene disruption by use of transcription activator-like effector nuclease (TALEN) in the water flea Daphnia pulex