Variety act

日期:2019-03-08 02:11:14 作者:程阀打 阅读:

THE developing nerves of insects and crustaceans are remarkably similar, say researchers in Chicago. Animals as varied as shrimps and grasshoppers are classified as arthropods because they all have hard exoskeletons and jointed limbs. But other features, such as their nervous systems, grow in different ways, leading biologists to believe that arthropods have more than one evolutionary origin. But when Molly Duman-Scheel and Nipam Patel of the University of Chicago examined the forerunners of nerve cells in eight arthropod species, they found that they shared the same proteins as cells in the developing nervous system of fruit flies (Development, vol 126, p 2327). “We see the exact same expression pattern,” says Patel,