These studies are now being done by GWAS in 2 patient groups, examining both baseline HbF and the HbF response to hydroxyurea. Genetic modulation of sickle cell disease: Homozygosity for a single Î²-globin gene mutation (HBB; glu6val) causes sickle cell anemia.hese studies are now being done by GWAS in 2 patient groups, examining both baseline HbF and the HbF response to hydroxyurea. Genetic modulation of sickle cell disease: Homozygosity for a single Î²-globin gene mutation (HBB; glu6val) causes sickle cell anemia.
Spiral Galaxies. Spiral galaxy M100. Spiral galaxies have three main components: a bulge, disk, and halo (see right). The bulge is a spherical structure found in the center of the galaxy. This feature mostly contains older stars. The disk is made up of dust, gas, and younger stars. The disk forms arm structures.
One such galaxy is shown in figure 1.4. Such galaxies (and the stars in them) are likely part of the very first generation of stars and galaxies to have formed. Figure 1.4: One of the most distant galaxies known appears as little more than a coloured spot on this section of the Hubble Deep Field.uch galaxies (and the stars in them) are likely part of the very first generation of stars and galaxies to have formed. Figure 1.4: One of the most distant galaxies known appears as little more than a coloured spot on this section of the Hubble Deep Field.