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A form of hemoglobulin present in high concentrations in the fetal stage of development but normally diminishing to a low concentration in children and adults except in certain anemias, leukemia, and hemoglobin disorders.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.