Blasticidin S hydrochloride is widely used in molecular biology and genetic research as a selective agent. It is particularly effective in selecting cells that have been transfected with plasmids containing the blasticidin resistance gene. This chemical inhibits protein synthesis in prokaryotic and eukaryotic cells, making it a valuable tool for ensuring that only genetically modified cells survive in culture. Researchers often use it in stable cell line development and in experiments requiring stringent selection pressure. Its application extends to studies involving gene expression, functional genomics, and the development of transgenic organisms. Additionally, it is employed in plant biotechnology to select transformed plant cells, aiding in the production of genetically modified crops.