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.
It holds the vital DNA of the cell. It contains hereditary materials known as chromosomes, acts as a control center for cell activities, and controls cell division. The function of nucleus is to control gene expression and mediate the replication of DNA during the cell cycle.