Embryonic hemoglobin is a tetramer produced in the blood islands in the embryonic yolk sac during the mesoblastic stage (first week of pregnancy until the end of the pregnancy). The protein is commonly referred to as Hemoglobin ε or HbE.
Chromosomal abnormalities can lead to a delay in switching from embryonic hemoglobin.
Subtypes include Gower 1, Gower 2, and Portland 2.
Famous quotes containing the word embryonic:
“Quintilian [educational writer in Rome around A.D. 100] thought that the earliest years of the child’s life were crucial. Education should start earlier than age seven, within the family. It should not be so hard as to give the child an aversion to learning. Rather, these early lessons would take the form of play—that embryonic notion of kindergarten.”
—C. John Sommerville (20th century)