<http://schema.org/description>
"Just as a uniform helps distinguish a soldier from a police officer, scientists use proteins that immune cells wear on their surfaces to determine their job in the body. T cells, for example, that display the CD8 protein are classified as 'cytotoxic lymphocytes', which kill off cancerous or infected cells, whereas those displaying the CD4 protein are identified as 'helper' T cells that coordinate the immune response."^^<http://www.w3.org/2001/XMLSchema#string>
<http://medicalxpress.com/news/2013-04-reassigning-cells-infection.html>