Antiphospholipid antibodies were originally thought to bind negatively
-charged (aniomic) phospholipids. Current evidence suggests that the t
arget antigen is considerably more complex and includes beta(2)-glycop
rotein I, a phospholipid-binding plasma protein. Our understanding of
the pathophysiology of the antiphospholipid syndrome has increased exp
onentially with a number of studies into the interactions of antiphosp
holipid antibodies and beta(2)-glycoprotein I.