Both drugs had been previously recommended for approval 14-0 by members of FDA's Anti-Infective Drugs Advisory Committee. The significance of two new antibiotics in four weeks? We've recently been averaging one antibiotic every three years.
More melanin presence in the skin makes the skin appear black, and less melanin will make the skin appear less black. White people have very little melanin synthesized by their skin. So, the color of the races is because of some difference in the quanitity of the melanin pigment in our body. That is all.
Melanin is produced by the oxidation of the amino acid tyrosine, followed by polymerization. The pigment is produced in a specialized group of cells known as melanocytes. There are three basic types of melanin: eumelanin, pheomelanin, and neuromelanin. The most common is eumelanin, of which there are two typesâbrown eumelanin and black eumelanin. Pheomelanin is a cysteine-containing red polymer of benzothiazine units largely responsible for red hair, among other pigmentation.