The<unk>  (short for<unk> gereis) is a human blood group defined by the presence or absence of the<unk>  antigen on a person's red blood cells. More than 99.9% of people are positive for the<unk>  antigen. Individuals with the rare<unk> -negative blood type, which is a recessive trait, can produce an anti-Lan antibody when exposed to<unk> -positive blood. Anti-Lan antibodies may cause transfusion reactions on subsequent exposures to<unk> -positive blood, and have also been implicated in mild cases of hemolytic disease of the newborn. However, the clinical significance of the antibody is variable. The antigen was first described in 1961, and<unk>  was officially designated a blood group in 2012.
Lan blood group system
Sid blood group system
Junior blood group system
Hh blood group
Rh blood group system
Augustine blood group system
P1PK blood group system
Vel blood group