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.
Generally, people with albinism have a problem with melanin production along the way. Melanocytes manufacture melanin. Manufacturing begins when melanocytes, following instructions in DNA, construct melanin-making enzymes -- you can think of these as production-line workers -- and the amino acid tyrosine. Production happens inside sacs called melanosomes. Melanosomes take in the enzymes and tyrosine.