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" ... Different hemoglobin variants are regulated so certain variants are expressed at distinct stages of development. Most members of the cattle family (bovidae) express a fetal hemoglobin gene that has a higher oxygen affinity than the adult variant, which enhances oxygen transfer across the placenta to the developing fetus. But shortly after birth, this fetal hemoglobin variant stops being expressed. This raises the question: did the Tibetan antelope somehow change its expression pattern so its fetal hemoglobin is preferentially expressed in adults, thereby making it possible for them to live in the harsh high-altitude environment that is their home? ... "