National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31170990, 81100992]; Fundamental Research funds for the Central UniversitiesFundamental Research Funds for the Central Universities [2012WYB01]; National Innovative Foundation Program for College Students of China [201310027028]; NIDAUnited States Department of Health & Human ServicesNational Institutes of Health (NIH) - USANIH National Institute on Drug Abuse (NIDA) [T32DA00i7238-23]; NATIONAL INSTITUTE ON DRUG ABUSEUnited States Department of Health & Human ServicesNational Institutes of Health (NIH) - USANIH National Institute on Drug Abuse (NIDA) [T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238, T32DA007238] Funding Source: NIH RePORTER