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Official Full Name: hemoglobin subunit gamma 2<br />Also known as: TNCY; HBG-T1<br />The gamma-globin genes (HBG1 and HBG2) are normally expressed in the fetal liver, spleen and bone marrow. The two gamma chains and the two alpha chains together make up fetal hemoglobin (HbF), which is normally replaced at birth by adult hemoglobin (HbA). In some beta-thalassemias and related diseases, gamma chain production continues into adulthood. These two types of gamma chains differ at residue 136, where glycine is present in the g-gamma product (HBG2) and alanine is present in the a-gamma product (HBG1). The former predominates at birth. The order of the genes in the beta-globin cluster is: 5'- epsilon -- gamma-G -- gamma-A -- delta -- beta--3'.