Description：Recombinant COVID-19 S Protein RBD is produced by mammalian expression system and the target gene encoding Asn331-Val524 is expressed with a mFc tag at the C-terminus.Form：Liquid in a 0.2 μm filtered solution of PBS, pH 7.4.Alternative Names：S protein RBD; 2019-nCoV S protein RBD Entrez Gene (Human)： QHD43416.1; Purity：Greater than 95% as determined by reducing SDS-PAGE.Chemical Structure：NITNLCPFGE VFNATRFASV YAWNRKRISN CVADYSVLYN SASFSTFKCY GVSPTKLNDL CFTNVYADSF VIRGDEVRQI APGQTGKIAD YNYKLPDDFT GCVIAWNSNN LDSKVGGNYN YLYRLFRKSN LKPFERDIST EIYQAGSTPC NGVEGFNCYF PLQSYGFQPT NGVGYQPYRV VVLSFELLHA PATVPRDCGC KPCICTVPEV SSVFIFPPKP KDVLTITLTP KVTCVVVDIS KDDPEVQFSW FVDDVEVHTA QTQPREEQFN STFRSVSELP IMHQDWLNGK EFKCRVNSAA FPAPIEKTIS KTKGRPKAPQ VYTIPPPKEQ MAKDKVSLTC MITDFFPEDI TVEWQWNGQP AENYKNTQPI MDTDGSYFVY SKLNVQKSNW EAGNTFTCSV LHEGLHNHHT EKSLSHSPGKDirections for Use：Please minimize freeze-thaw cycles.Quality Control：Endotoxin: Less than 0.1 ng/µg (1 IEU/µg) as determined by LAL test.Storage/Stability：Store it at -20°C to -80°C for one year. It is recommended that the protein be aliquoted for optimal storage. Avoid repeated freeze-thaw cycles.