Lipoprotein (a), or Lp (a), is a protein that transports cholesterol in the blood. High levels of Lp (a) in the blood can increase the likelihood of plaques or blood clots forming in the arteries Synthesized exclusively by B cells, antibodies are produced in billions of forms, each with a different amino acid sequence and a different antigen-binding site. Collectively called immunoglobulins (abbreviated as Ig), they are among the most abundant protein components in the blood, constituting about 20% of the total protein in plasma by .

how does serum differ from plasma