label: SARS-CoV-2 virus recombinant spike (S) protein receptor binding domain (RBD) fusion heterodimer (B.1.351-B.1.1.7 strains)
label_lc: sars-cov-2 virus recombinant spike (s) protein receptor binding domain (rbd) fusion heterodimer (b.1.351-b.1.1.7 strains)