Angiotensin-converting enzyme 2 (ACE2, also known as ACEH) is a transmembrane protein and acts as receptor for SARS-CoV, SARS-CoV-2 and some other coronaviruses. The large extracellular peptidase domain of ACE2 is known to interact with the spike proteins of coronaviruses. The small C-terminal collectrin-like domain (CLD) has recently been described to mediate homo-dimerization of ACE2. The main function of ACE2 is the catalytic conversion of angiotensins, thereby regulating cardiovascular homeostasis. Recombinant Human ACE2 (insect cells) protein covers amino acids Q18 to D615 of human ACE2