After careful examination, and as confirmed by the Ethics Committee of the Consejo Superior de Investigaciones Científicas (CSIC) on 25 July 2012, there is a need to question the validity of the laboratory analyses conducted by Dr J. A. Lemus in the above paper, published in Proceedings of the Royal Society B: Biological Sciences. I am unable to repeat these analyses with the same samples given the ephemeral nature of the material used (fresh blood and plasma). Therefore, I wish to retract this published manuscript.
Department of Evolutionary Ecology, National Museum of Natural History (CSIC), José Gutiérrez Abascal 2, 28006 Madrid, Spain,
- This journal is © 2012 The Royal Society