Doors 32 Documentation. Our longstanding and much loved Doors32 Software is now available only via download from Keri's web site or special order, but is still free of charge. It will continue to be available as long as customers ask for it and computers with compatible operating systems exist.
Cell biology The reduction of a cellâs response to a hormone or other ligand by internalizing its cognate receptor and degrading it within a coated pit; downregulation is a mechanism by which receptors respond to an excess of ligands.
cell. How can a cell make sense of all these signals? Cells have receptors. A receptor is a protein that detects a signal and acts because of it. Only certain molecules will bind to a receptor. A cell responds to a signal only if it has a receptor for that signal. When a receptor binds to a signal, it changes shape. As a result,