Tags: Protein.
Apolipoprotein O also known as protein FAM121B is a protein that in humans is encoded by the APOO gene. APOO is a member of the apolipoprotein family.The human apolipoprotein O is a 198 amino acids protein that contains a 23 amino acids long signal peptide. The apoprotein is secreted by a microsomal triglyceride transfer protein (MTTP)-dependent mechanism probably as a VLDL-associated protein that is subsequently transferred to HDL.