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Few clues in medicine are as dramatic as the
relationship between HLA B27 and the development
of ankylosing spondylitis. HLA B27 is a genetic trait that
one is born with, much as your blood type, A, B, AB, or
O, is determined at birth. While there are only four blood
types, there are hundreds of HLA types. About one person
in every fourteen in the US has the B27 type.
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