What Is Pelvic Pain? If you have pain below your belly button and above your legs, it counts as pelvic pain. It can be caused by a lot of things. It may be a harmless sign that youâre fertile, a digestive disorder, or a red flag that you need to go to the hospital.
Thyroxine-binding globulin (TBG) binds thyroid hormone in circulation. It is one of three proteins (along with transthyretin and albumin) responsible for carrying the thyroid hormones thyroxine (T4) and 3,5,3â-triiodothyronine (T3) in the bloodstream.Of these three proteins, TBG has the highest affinity for T4 and T3, but is present in the lowest concentration.t is one of three proteins (along with transthyretin and albumin) responsible for carrying the thyroid hormones thyroxine (T4) and 3,5,3â-triiodothyronine (T3) in the bloodstream. Of these three proteins, TBG has the highest affinity for T4 and T3, but is present in the lowest concentration.
In hemoglobin, each subunit contains a heme group, which is displayed using the ball-and-stick representation in Figure 2. Each heme group contains an iron atom that is able to bind to one oxygen (O 2) molecule. Therefore, each hemoglobin protein can bind four oxygen molecules. One of the most important classes of chelating agents in nature are the porphyrins. A porphyrin molecule can coordinate to a metal using the four nitrogen atoms as electron-pair donors, and hence is a polydentate ligand (see Figure 1).