1. I always use urethan coat.

2. Methods:Urethan water solution was administered by intraperitoneal injection to induce lung tumor nodes in the male offspring of A6 transgenic mouse, in which the NS gene is expressed in the lung.

3. Extracellular recording method was used to observe 51-unit spontaneous discharge of paraventricular nuclei(PVN) in 28 urethan anaesthetized rabbits.

4. The aortic nerve(AN) stimulation-produced depressor and bradycardic responses were elicited in urethan and chloralose aneasthetized rabbits.

5. Microscopically, the pulmonary cells proliferated to form neoplastic mass about 22 days after the first administration of urethan.