Rare Blood Types
In the "ABO" system, all blood belongs to one of four major groups: A, B, AB, or O. But there are more than two hundred minor blood groups that can complicate blood transfusions. These are known as rare blood types. Whereas common blood types are expressed in a letter or two, with maybe a plus or a minus, a smaller number of people express their blood type in an extensive series of letters in addition to their 'AB-' type designation.
Read more about this topic: Human Blood Group Systems
Famous quotes containing the words rare, blood and/or types:
“How rare to be born a human being!
Wash him off with cedar-bark and milkweed
send the damned doctors home.
Baby, baby, noble baby,
Noble-hearted baby”
—Gary Snyder (b. 1930)
“To-day there is hardly a woman of intelligence in all America ... who is not definitely and actively concerned in some social interest, who does not recognize some duty besides those incident to her own blood relationship.”
—Charlotte Perkins Gilman (1860–1935)
“He types his laboured column—weary drudge!
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Spare, editor, to condemn
These dry leaves of his autumn.”
—Robertson Davies (b. 1913)