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.
Viral receptors can also be species specific. The poliovirus receptor, for instance, is only found on primate cells [11]. How an individual virus evolves to make use of a particular cellular receptor is an intriguing and unresolved question. This issue is pertinent to proteinâprotein recognition on cell surfaces.