MBP and multiple sclerosis: Model antigens functioned as SARS-CoV-2 spike glycoprotein (UniProt: P0DTC2) and SARS-CoV-2 nucleocapsid protein (UniProt: P0DTC9) related to a COVID-19 infection, MBP (UniProt: P02686) for multiple sclerosis, and AChRα (UniProt: P02708) for myasthenia gravis.