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  2. Embryonic hemoglobin - Wikipedia

    en.wikipedia.org/wiki/Embryonic_hemoglobin

    Hemoglobin Portland II (also referred to as ζ 2 β 2 or HbE Portland-2) is a form of hemoglobin existing at low levels during embryonic and fetal life, composed of two zeta chains and two beta chains.

  3. Nucleated red blood cell - Wikipedia

    en.wikipedia.org/wiki/Nucleated_red_blood_cell

    A human peripheral blood smear; NRBCs are visible as larger cells with dark centers.. A nucleated red blood cell (NRBC), also known by several other names, is a red blood cell that contains a cell nucleus.