Completion of the Rattus norvegicus genome sequence enabled a global inventory and analysis of the nuclear receptors (NRs) in three mammalian species.

Although many wild and domestic animals can serve as reservoir hosts, the brown rat ( Rattus norvegicus) is the most important source of human infections.

A total of 36 weaning rats ( Rattus norvegicus) were divided into 6 groups of six animals and exposed to lead acetate for six weeks.