Recombinant human ACE2 (angiotensin converting enzyme 2), encompassing amino acids 18-740. The protein is fused at the C-terminus with the Fc fragment of a human IgG1 followed by a C-terminal Avi-Tag™. The recombinant protein was enzymatically biotinylated using the Avi-Tag™ and affinity purified. HiP™ indicates a high purity protein (≥90% pure) and less than 10% aggregation as measured by gel filtration.