This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).
This article has been retracted at the request of the Editor-in-Chief and Authors.
The authors informed the journal that the methods are sound but that there are errors in the calculations of the 4NTP activity. After extensive review and many unsuccessful attempts to resolve the data calculations, the authors concluded that they cannot be resolved and brought the issue to the journal Editor and Publisher.
