RETRACTED: Periaqueductal gray knockdown of V2, not V1a and V1b receptor influences nociception in the rat

This article has been retracted at the request of the Editor-in-Chief. Please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).Reason: This article has been found to contain incorrect sequence descriptions of siRNAs, which makes replication of the reported experiments impossible. The validity of the sequence description given in this article cannot be established on the basis of the experiments described. As such this article represents a severe abuse of the scientific publishing system. The scientific community takes a very strong view on this matter and we apologize to readers of the journal that this was not detected during the submission and review process.