Sea Urchin Genome Suprisingly Similar To Man And May Hold Key To Cures ScienceDaily 12/7/06 "...it shares a common ancestor with humans. Sea urchins are closer to human and vertebrates from an evolutionary perspective than other more widely studied animal models, such as fruit fly or worms. The purple sea urchin, in fact, has 7,000 genes in common with humans,...Of particular interest to Calestani is the way the sea urchin's immune system works. The human immune system has two components: innate immunity, with which we are born, and acquired immunity, which is the ability to produce antibodies in response to an infection. Sea urchins only have innate immunity, and it is greatly expanded with 10 to 20 times as many genes as in human.
"Considering that sea urchins have a long life span -- some can live up to 100 years -- their immune system must be powerful," Calestani said. "Sea urchins could very well provide a new set of antibiotic and antiviral compounds to fight various infectious diseases.""
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