VLPd
VLPd is a term that can refer to several different concepts, depending on the context. One prominent meaning relates to Virus-Like Particles (VLPs) in the field of vaccinology. VLPs are non-infectious protein structures that mimic the outer shell of a virus. They are produced by expressing viral proteins in host cells, which then self-assemble into particle structures. VLP technology is used to develop vaccines because these particles can elicit a strong immune response without the risk of causing infection. The "d" in VLPd might indicate a specific type or modification of a VLP, though this is not a universally standardized notation. For instance, it could denote a dimerized VLP or a VLP with a particular functionalization.
In other contexts, VLPd could be an acronym specific to a particular organization, project, or technical specification.