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one gene when you're a fetus called fet fetal hemoglobin. When you're adult you have a different gene but they both are making a protein that carries oxygen.
when you after you're born the fetto hemoglobin gene gets just turned off just goes away and you replace it with adult hemoglobin but if your gene for
hemoglobin is bad as an adult that one of the therapies is well let's turn back on the gene that you had when you were a fetus and it's actually already led to
Listen to native speakers pronounce “fetto” in real conversational contexts with synchronized timestamps and subtitles.