Mondo Description Any classic complement early component deficiency in which the cause of the disease is a mutation in the C4B gene.

Uniprot Description A rare defect of the complement classical pathway associated with the development of autoimmune disorders, mainly systemic lupus with or without associated glomerulonephritis.

Disease Ontology Description A complement deficiency that is characterized by recurrnet bascterial infections, caused by C4B deficiency.