In addition to factor H, other C3b regulators, such as MCP and Complement Factor I (CFI) genetic mutants [typically associated with atypical hemolytic uremic syndrome (aHUS)], in pregnant women with systemic lupus erythematosus (SLE) or antiphospholipid antibodies (APL Ab) have been identified, indicating their higher susceptibility to develop preeclampsia than normal women (394). Here, C3 is linked to preeclampsia.