To facilitate the change from the nomenclature hitherto employed the following is suggested:
Jansky ....0(I) A(II) B(III) AB(IV)
Moss ... O(IV) A(II) B(III) AB(I)This classification became widely accepted and after the early 1950s it was universally followed.Hirszfeld and Dungern discovered the inheritance of blood types as Mendelian genetics in 1910 and the existence of sub-types of A in 1911. In 1927, Landsteiner, with Philip Levine, discovered the MN blood group system, and the P system. Development of the Coombs test in 1945, the advent of transfusion medicine, and the understanding of ABO hemolytic disease of the newborn led to discovery of more blood groups. As of 2020, the International Society of Blood Transfusion (ISBT) recognizes 41 blood groups. Society and culture
A popular pseudoscientific belief in Eastern Asian countries (especially in Japan and South Korea) known as 血液型 ketsuekigata / hyeoraekhyeong is that a persons ABO blood type is predictive of their personality, character, and compatibility with others. Researchers have established no scientific basis exists for blood type personality categorization, and studies have found no "significant relationship between personality and blood type, rendering the theory "obsolete" and concluding that no basis exists to assume that personality is anything more than randomly associated with blood type." See also
Blood type (non-human)
Human leukocyte antigen
hh blood group

References
Further reading
Dean, Laura (2005). Blood Groups and Red Cell Antigens, a guide to the differences in our blood types that complicate blood transfusions and pregnancy. Bethesda MD: National Center for Biotechnology Information. ISBN 1-932811-05-2. NBK2261. Mollison PL, Engelfriet CP, Contreras M (1997).
Onychogryphosis  is a hypertrophy that may produce nails resembling claws or a rams horn. Causes
Onychogryphosis may be caused by trauma or peripheral vascular disease, but most often secondary to self-neglect and failure to cut the nails for extended periods of time. : 783–4  This condition is most commonly seen in the elderly. Diagnosis
Treatment
Some recommend avulsion of the nail plate with surgical destruction of the nail matrix with phenol or the carbon dioxide laser, if the blood supply is adequate. : 783–4 : 659

Epidemiology
Severe congenital onychogryphosis affecting all twenty nailbeds has been recorded in two families who exhibit the dominant allele for a certain gene. Congenital onychogryphosis of the fifth toe (the baby, little, pinky or small toe) is fairly common, but asymptomatic and seldom brought to the attention of medical professionals. Rather, it is brought to the attention of manicurists who routinely file the clawed toenail flat. See also
List of cutaneous conditions

References


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