Enables complement component C3b binding activity and heparin binding activity. Acts upstream of or within several processes, including animal organ development; complement activation; and vasculature development. Located in several cellular components, including axon; external side of plasma membrane; and neuronal cell body. Is expressed in several structures, including adrenal gland; bone; central nervous system; humerus cartilage condensation; and metanephros. Used to study age related macular degeneration 4; atypical hemolytic-uremic syndrome; hemolytic-uremic syndrome; and membranoproliferative glomerulonephritis. Human ortholog(s) of this gene implicated in several diseases, including atypical hemolytic-uremic syndrome; eye disease (multiple); hemolytic-uremic syndrome; lupus nephritis; and systemic lupus erythematosus. Orthologous to several human genes including CFH (complement factor H). [provided by Alliance of Genome Resources, Apr 2022]