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.
A receptor could be an area or multiple areas on the outside of a cell, must likely a Eukaryote cell. When another organism sends a chemical signal to the cell the signal would be picked up by the receptor. A receptor could start a signal transduction or could cause endocytosis to occur. I'm going to give you two definitions to choose from.. 'Its a protein that allows signal molecules to attach to it.