Blasticidin S Hydrochloride belongs to a group of cytosine amino nucleoside antibiotics. The compound Blasticidin S has a wide spectrum of antimicrobial activity and acts on prokaryotic and eukaryotic organisms by inhibiting protein synthesis. Blasticidin S Hydrochloride belongs to a group of cytosine amino nucleoside antibiotics. The compound Blasticidin S has a wide spectrum of antimicrobial activity and acts on prokaryotic and eukaryotic organisms by inhibiting protein synthesis. Blasticidin-S is a commonly used tool in genetic engineering. Blasticidin-S inhibits protein synthesis in both prokaryotic and eukaryotic cells. It is common method to include a gene for Blasticidin S resistance into the plasmid being inserted into the target cells, and then to apply Blasticidin S to the culture to select these cells that have acquired that immunity. The Blasticidin S gene resistance gene (BSR), found in Bacillus cereus K55-S1, has been used in multiple studies for its use as a selective compound. Another antibiotic that belongs to the family of nucleosides is puromycin