Scientific Reports 5: Article number: 9009; published online: 11 March 2015; updated: 15 July 2015

Sonali N. Reisinger was omitted from the author list in the original version of this Article. This has been corrected in the PDF and HTML versions of the Article.

The Author Contributions section now reads:

DDP designed the study and wrote the manuscript. EK carried out molecular and biochemical analysis and wrote the manuscript. SS and FJM performed cell-culture and uptake assays. WFD assisted in gene expression analyses. GS carried out stereotactic surgeries and behavioral analysis. SNR, DK and MR performed behavioral experiments. FK carried out radioligand binding assays. MC assisted in biochemical experiments. MF contributed to the study design, analysis and interpretation of data and writing of the manuscript.