Submitted on: 02 October 1999.
Revised on: 22 October 1999.
Accepted on: 30 October 1999.
PHARMACOLOGY BIOCHEMISTRY AND BEHAVIOR
http://reply.papertrans.cn/3/245/24419/24419-32.png
Submitted on: 20 August 2008.
Revised on: 24 September 2008.
Accepted on: 22 October 2008.
PHARMACOLOGY BIOCHEMISTRY AND BEHAVIOR
http://reply.papertrans.cn/3/245/24419/24419-34.png
http://reply.papertrans.cn/3/245/24419/24419-35.png
http://reply.papertrans.cn/3/245/24419/24419-36.png