<http://www.w3.org/1999/02/22-rdf-syntax-ns#first>
<http://ichef-1.bbci.co.uk/news/560/media/images/79436000/jpg/_79436986_c0210747-hiv_particles_and_dendritic_cell,_artwork-spl(1).jpg>
<http://www.bbc.com/news/health-30254697>