2 zeta and 2 gamma chains are present in which hemoglobin
Hb portland - 2 zeta & 2 gamma.
Hb Gower I - 2 zeta & 2 epsilon.
Hb gower II - 2 alpha & 2 epsilon.
Hb Portland
Hb gower I
Hb gower II
HbA2
Hb Portland