Scientific Reports 3, Article number: 2445 (2013); Published: 15 August 2013; Updated: 5 December 2013

Affiliation 1 was incorrect in the original version of this Article. The affiliation was incorrectly listed as ā€œQingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, Chinaā€. The correct affiliation is listed above and has been corrected in the HTML and PDF versions of this Article.