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.
melanocyte stimulating hormone gets its name because of its effect on melanocytes skin cells that contain the black pigment melanin in humans melanocytes are responsible for moles freckles and suntan and if they turn cancerous melanomain most vertebrates msh is produced by an intermediate lobe of the pituitary gland its secretion causes a dramatic darkening of the skin of fishes amphibians and reptilesn humans melanocytes are responsible for moles freckles and suntan and if they turn cancerous melanoma in most vertebrates msh is produced by an intermediate lobe of the pituitary gland its secretion causes a dramatic darkening of the skin of fishes amphibians and reptiles