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Title
Vitamin D.
Abstract
The article discusses about vitamin D which is known as a secosteroid molecule having hormone activities in human. Accordingly, most cells and tissues in the body contain vitamin D receptors that motivate nuclear transcription of various genes either to provide rapid response in cellular membranes or change cellular function. It mentions that the world's population are depending on skin exposure to ultraviolet radiation in the blue spectrum (UVB) in order to allow for endogenous production of vitamin D or vitamin D supplementation.