Nature and Science must have some kind of agreement. Last week was the Nature honey bee genome special, this week is the Science sea urchine genome special.
Sequencing was apparently difficult due to high heterozygosity. The current sequence is a high-quality draft but is a mosaic of two haplotypes. However, it’s good enough to estimate genome size (814 Mbp) and identify genes (~ 23 300). A separate paper is an impressive study of the complete sea urchin embryo transcriptome.
I have to admit that I hadn’t realised the significance of the sea urchin as a model organism. My experience of them is limited to (1) trying not to crawl over them when diving and (2) wondering if they taste any good whilst watching Iron Chef.