Viral infections are common in babies and children and often cause a minor rash of the skin. These rashes are usually harmless and will go away on their own. Different viruses can cause different rashes, and sometimes different viruses can cause rashes that look the same.
receptors for both lipid-soluble and lipid-insoluble hormones are found within the cell and usually within the nucleus. receptors for lipid-soluble hormones are on or in the cell membrane, whereas receptors for lipid-insoluble hormones are inside the cell.
Lipophilic Hormones with Intracellular Receptors. Many lipid-soluble hormones diffuse across the plasma membrane and interact with receptors in the cytosol or nucleus. The resulting hormone-receptor complexes bind to transcription-control regions in DNA thereby affecting expression of specific genes (see Figure 20-2a).Hormones of this type include the steroids (e.g., cortisol, progesterone, estradiol, and testosterone), thyroxine, and retinoic acid (see Figure 10-65).he resulting hormone-receptor complexes bind to transcription-control regions in DNA thereby affecting expression of specific genes (see Figure 20-2a). Hormones of this type include the steroids (e.g., cortisol, progesterone, estradiol, and testosterone), thyroxine, and retinoic acid (see Figure 10-65).