Cold agglutinin disease. Cold agglutination - at body temperature, the antibodies do not attach to the red blood cells. At lower temperatures, however, the antibodies react to Ii antigens, bringing the red blood cells together, a process known as agglutination.
American Robin (Turdus migratorius). The robin red breast was designated as the state bird of Michigan by House Concurrent Resolution No. 30, the Senate concurring, on April 8, 1931.
Citing the blossom of the native Michigan Pyrus coronaria (sweet crabapple) as particularly beautiful and fragrant, the legislation does not specify this species as the state flower but refers to the generic apple blossom as the state flower of Michigan.