Hot on the heels of the honeybee, the latest animal to have its genome sequenced is the urchin. This longstanding testbed for embryologists actually has more genes in common with us than worms or fruit flies do. The urchin's sequencers identified 23,300 genes, of which 7,077 are shared with humans. The creature has the most complex innate immune system yet studied, judging from its mix of genes, and it also expresses genes related to vision in its tubular feet, suggesting the appendages can sense light, researchers report in this week's Science.