A genetically modified rat model has been developed by deleting the Toll-like Receptor 4 (Tlr4) gene, creating the first instance of its kind in rats. This model has been successfully produced and characterized in vivo, making it a robust tool for studying immune responses and neurological functions. Its design enables researchers to explore Tlr4’s role in inflammation, neurological disorders, and various biological pathways. The rat’s larger size and closer physiological resemblance to humans, compared to mice, further enhance its utility, particularly in experimental contexts that require detailed investigation and precise data collection.