In simultaneous press conferences in Brussels and Washington, researchers unveiled the complete genome of the most complex organism yet sequenced—brewer's yeast. The 12-million-base sequence, the result of a European Union-funded collaboration of more than 100 laboratories, is the first for a member of the eukaryotes—organisms that, unlike bacteria, have nucleated cells, among them all multicelled animals and plants. The similarities of yeast genes to those of more complex organisms, including humans, is already drawing a host of researchers eager to exploit the sequence.