Coronavirus membrane protein

Major structure in coronaviruses

The membrane (M) protein is an integral membrane protein that is the most abundant of the four major structural proteins found in coronaviruses. The M protein organizes the assembly of coronavirus virions through protein-protein interactions with other M protein molecules as well as with the other three structural proteins, the envelope (E), spike (S), and nucleocapsid (N) proteins.

This keyword could refer to multiple things. Here are some suggestions: