The long-standing model of pigment cell origins is implicitly based upon a progressive fate restriction model of neural crest development and postulates the existence of a partially restricted progenitor common to all pigment cell types (i.e., a chromatoblast) [38] .
Sodium is the fourth most abundant element on earth, comprising about 2.6% of the earth's crust; it is the most abundant of the alkali group of metals. It is now obtained commercially by the electrolysis of absolutely dry fused sodium chloride.
What is sodium to my body? Sodium is a mineral thatâs essential for life. Itâs regulated in the body by your kidneys, and it helps control your bodyâs fluid balance. It also helps send nerve impulses and affects muscle function.