Here's an interesting retraction just published in the Journal of Neuroscience:
Retraction for Ma et al., Glucagon-Like Peptide 1 Stimulates Hypothalamic Proopiomelanocortin Neurons
Retraction: At the request of the authors, the following manuscript has been retracted: "Glucagon-Like Peptide 1 Stimulates Hypothalamic Proopiomelanocortin Neurons" by Xiaosong Ma, Jens Bruning, and Frances M. Ashcroft, which appeared on pages 7125-7129 of the July 4, 2007 issue.
This is it, the entire text of the retraction. There is absolutely no mention of why the paper is being retracted. People who have relied on the retracted manuscript to develop their own research conceptually and/or methodologically have been given no guidance whatsoever on what aspects of the manuscript are considered unreliable, and/or why.
Is this ethical behavior? Do the authors have an obligation to the scientific community to come clean with everything they know about the whats and whys of their retraction?