the addition of the disaccharide lipid a precursor iva , commercial lipopolysaccharide ( 1 microgram/ml ) , phorbol 12-myristate 13-acetate ( 10 ( -7 ) m ) , or calcium ionophore a23187 ( 10 ( -6 ) m ) to these cells resulted in a similar increase in lysophosphatidylinositol levels , but phosphatidic acid was inactive .
C0023767
lipid a
C0023810
lipopolysaccharide