Polyclonal B cell activatorMeSH Supplementary Concept
Preferred Label : polyclonal B cell activator;
MeSH note : factor found in alpha(2)-macroglobulin fraction of serum of patients with rheumatoid
arthritis which produces polyclonal B cell activation; combination of rheumatoid factor
& polyclonal B cell activator; titer provides a confidant laboratory measurement of
disease involvement;