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.
Moles are made of cells called melanocytes. Melanocytes are found scattered throughout our skin and are the cells that make our skin become tan by generating a pigment called melanin. A mole is made of many melanocyte cells clustered together. When a mole becomes cancer it is called melanoma.oles are made of cells called melanocytes. Melanocytes are found scattered throughout our skin and are the cells that make our skin become tan by generating a pigment called melanin. A mole is made of many melanocyte cells clustered together. When a mole becomes cancer it is called melanoma.