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Summary The life span of adult cells is restricted, becoming senescent and eventually undergoing apoptosis. Cells are replaced by new ones which originate from a population of stem cells. An example is provided by the hemopoietic system in the bone marrow. In an adult body, stem cells may be...
Summary The physiological role of thyreoliberin (TRH) is the preservation of homeostasis within four systems (i) the hypothalamic-hypophsysiotropic neuroendocrine system, (ii) the brain stem/midbrain/spinal cord system, (iii) the limbic/cortical system, and (iv) the chronobiological system. Thus...
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