A four-base deletion 5' to the A gamma globin gene is a common polymorphism.
M B
MB
Coleman
M H
MH
Steinberg
J G
JG
Adams
D002872:Chromosome Deletion; D005260:Female; D005914:Globins / Q000235:genetics*; D006801:Humans; D012150:Polymorphism, Restriction Fragment Length; D044469:Racial Groups / Q000235:genetics
D005914:Globins