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.
the skin serves as the primary barrier to the external environment melanocytes provide photoprotection by producing melanin the degree of pigment in the skin is reflected in the skin color which is the most useful predictor of human skin cancer risk in the general populationn embryonic day 14 5 melanocytes exit from the overlying dermis and populate the epidermis and developing hair follicles melanocytes also travel to the leptomeninges iris choroid of the posterior eye and stria vascularis of the cochlea