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Cholesterol is the precursor of the five major classes of steroid hormones.The synthesis of steroid hormones is initiated by the removal of a six-carbon unit from carbon 20 of the cholesterol side chain to form pregnenolone, the ordinary precursor of all steroid hormones. A series of reactions catalyzed by cytochrome P450 change pregnenolone to give increase to the individual hormones.
Figure: Biosynthetic pathway for the synthesis of the steroid hormones.
The risk of PVE is greatest during the initial 6 months after valve surgery (particularly during the initial 5 to 6 weeks) and thereafter declines to a lower but persistent risk (0
Risk Assessment of Biological Hazards Biological hazards of concern to public health include pathogenic strains of bacteria, viruses, helminths, protozoa, algae and certain tox
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