Endostatin Is a 184-Amino Acid Protein That Only Affects Endothelial

Endostatin is a 184-amino acid protein that only affects endothelial cells for what reason?

A) Endothelial cells produce endostatin.
B) Endostatin can diffuse across the membrane of endothelial cells.
C) Only endothelial cells are exposed to endostatin.
D) Endothelial cells have a receptor on their cell membrane for endostatin.
E) Endostatin enters endothelial cells by endocytosis.