In Science this week, an international research team led by investigators at Indiana University report a draft sequence for the microcrustacean Daphnia pulex genome, "which is only 200 megabases and contains at least 30,907 genes." The team shows that tandem gene clusters generate the high gene count, and that "more than a third of Daphnia's genes have no detectable homologs in any other available proteome, and the most amplified gene families are specific to the Daphnia