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.
Skin color is due primarily to the presence of a pigment called melanin, which is controlled by at least 6 genes. Both light and dark complexioned people have melanin. However, two forms are produced--pheomelanin, which is red to yellow in color, and eumelanin, which is dark brown to black.
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.