MN blood type is also a blood type that belongs to the MN blood group system, note that it should be in capital letters. there are three blood types in the MN blood group system, M blood type, N blood type and MN blood type. The MN blood group system and the ABO blood group system that we often hear about are both independent methods of classifying blood groups. There are many ways to classify human blood groups, but the ABO blood group system is the most important and most closely related to the clinical aspects of blood transfusion and organ transplantation. For example, a person’s blood type is A, MN type, indicating that this person’s blood type to ABO blood group classification, belongs to the A blood type; to MN blood group classification, belongs to the MN blood type. MN blood group system in the clinical application is relatively small, but in the forensic practice activities are widely used.