Fetal hemoglobin

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What Wikipedia says

Fetal hemoglobin, or foetal haemoglobin (also hemoglobin F, HbF, or α2γ2) is the main oxygen carrier protein in the human fetus. Hemoglobin F is found in fetal red blood cells, and is involved in transporting oxygen from the mother's bloodstream to organs and tissues in the fetus.

Excerpt from the Wikipedia article “Fetal hemoglobin”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: AngelHerraez, Public domain, via Wikimedia Commons.