The V-PLEX SARS-CoV-2 Key Variant RBD Panel 1 (ACE2) Kit is a multiplex assay for antibodies that block the binding of ACE2 to RBD antigens from key past and present variants of SARS CoV-2. It includes antigens from Alpha, Beta, Delta, and several sublineages of Omicron. Key Variant RBD Panel 1 includes: A (WT), (B.1.1.7), (B.1.1.529; BA.1; BA.1.15), (B.1.351; B.1.351.1), (AY.3; AY.4; AY.4.2; AY.5; AY.6; AY.7; AY.12; AY.14; B.1.617.2; B.1.617.2+∆144), (BA.2; BA.2.1; BA.2.2; BA.2.3; BA.2.5; BA.2.6; BA.2.7; BA.2.8; BA.2.10; BA.2.12), (BA.2.12.1), (BA.2.75), and (BA.4; BA.5).