SARS-CoV-2 Spike NTD, His Tag (S1D-C52Hh) is expressed from human 293 cells (HEK293). It contains AA Ser 13 - Leu 303 (Accession QH D43416.1). The mutations (T19R, G142D, EF156-157del, R158G) were identified in the SARS-CoV-2 variants which emerged i 1 * 100 µG