DEFINITION of 'Commercial'. Relating to commerce. In the investment field, the term commercial is generally used to refer to a trading entity engaged in business activities that are hedged by positions in the futures or options markets.
The melanocortin 1 receptor controls which type of melanin is produced by melanocytes. When the receptor is activated, it triggers a series of chemical reactions inside melanocytes that stimulate these cells to make eumelanin. If the receptor is not activated or is blocked, melanocytes make pheomelanin instead of eumelanin.
At the bottom of the basal layers of our skin we have these cells call melanocytes. These cells are responsible for the production of melanin through a process called melanogenesis. Melanin is the pigment that gives our skin, eyes and hair its color[1]. It is also one of the several skin chromophores our skin supports. Chromophores are molecules that absorb light. In doing so, they impart a specific color. ( we will discuss light absorption and color in another science post).