two patients ( brother and sister , 41 and 39 yr of age , respectively ) have been shown to have marked elevation of plasma triglycerides and chylomicrons , decreased low density lipoproteins ( ldl ) and high density lipoproteins ( hdl ) , a type i lipoprotein phenotype , and a deficiency of plasma apolipoprotein c-ii ( apo c-ii ) .
C0008731
chylomicrons
C0023820
lipoprotein