Human red cell antigens Human red cell antigens In addition to the defined human blood group systems, there are erythrocyte antigens which do not meet the definition of a blood group system. Most of these are either nearly universal in human blood or extremely rare and are rarely significant in a clinical setting. Reagents to test for these antigens are difficult to find and many cannot be purchased commercially. These three groups are antigens with shared characteristics but do not meet the International Society of Blood Transfusion (ISBT) definition of a human blood group system. Further research may identify them as blood group systems.
Blood Red Horse Blood Red Horse Blood Red Horse is a 2004 young adult historical novel by author K M Grant. The book was published in 2004 by Puffin Books and in the US in 2005 by Walker Children's. "Blood Red Horse" is the first novel in the De Granville Trilogy and was followed by the books "Green Jasper" and "Blaze of Silver". In 2006 the audiobook version of "Blood Red Horse" won an AudioFile Earphones Award and in 2007 was one of YALSA's recommended audiobooks for 2007. "Blood Red Horse" follows Will and Ellie, two young teens growing up during the time