JAPAN: Kao Corp. researchers have discovered that melanocytes, which are located in the bottom layer of the skin epidermis, are not the only cells involved in determining skin color. The company has found that keratinocytes affect the activity of melanocytes and so also play a role. Since keratinocytes are found above melanocytes near the surface of skin, Kao told Nikkei it intends to pursue this finding in hopes of developing new skin-lightening cosmetics....