An update on the Lutheran blood group system

This update of the Lutheran (LU) blood group system (Daniels G. Lutheran. Immunohematology 2009;25:152–9) describes six new antigens of the Lutheran system (International Society of Blood Transfusion system 5). These antigens are numbered LU22 to LU27, resulting in a total of 25 antigens in the system. The molecular background of LU7 is also described. New KLF1 mutations responsible for In(Lu) have been identified, and the gene responsible for the X-linked form of Lu_mod has been identified.