The fire emoji next to a friend's name means that you and that special, special person in your life have snapped one another within 24 hours for at least two days in a row. You know, like your friendship is on fire? Or...
In adult humans, the most common hemoglobin type is a tetramer (which contains 4 subunit proteins) called hemoglobin A, consisting of two Î± and two Î² subunits non-covalently bound, each made of 141 and 146 amino acid residues, respectively. This is denoted as Î± 2 Î² 2.
Of the four globins that make up hemoglobin, two are identical and called alpha chains, and the other two are called beta chains and are also identical. They can also be called alpha-globins and beta-globins. The quaternary structure of hemoglobin is these units fitting together.f the four globins that make up hemoglobin, two are identical and called alpha chains, and the other two are called beta chains and are also identical. They can also be called alpha-globins and beta-globins. The quaternary structure of hemoglobin is these units fitting together.