Lasein

Lasein is a fictional substance appearing in the science fiction novel "The Expanse" series by James S.A. Corey. It is a specialized biological agent, a type of genetically engineered virus, designed for specific combat applications. Lasein is not a naturally occurring element or compound. Its primary purpose is to incapacitate and kill targets by inducing rapid, fatal physiological breakdown.

The development and deployment of lasein are central to certain plotlines in "The Expanse," highlighting the ethical and strategic implications of advanced biological warfare. It is characterized by its highly contagious nature and its devastating effectiveness, posing a significant threat within the narrative. The creators and users of lasein operate with a distinct military or clandestine agenda. Its existence and potential use raise questions about the boundaries of scientific research and the morality of weaponizing biological agents. Lasein serves as a narrative device to explore themes of technological advancement, human conflict, and the consequences of wielding such potent tools.