<http://schema.org/description>
"(Medical Xpress)\u2014Scientists at Emory Vaccine Center have shown that an immune regulatory molecule called IL-21 is needed for long-lasting antibody responses in mice against viral infections."^^<http://www.w3.org/2001/XMLSchema#string>
<http://medicalxpress.com/news/2013-05-vaccine-blackjack-il-critical-viral.html>