Proceedings of the National Academy of Sciences (2012) - Comment
pubmed: 22308347  doi: 10.1073/pnas.1112209109  issn: 0027-8424  issn: 1091-6490 

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Neha Sehgal, Alok Gupta, Rupanagudi Khader Valli, Shanker Datt Joshi, Jessica T. Mills, Edith Hamel, Pankaj Khanna, Subhash Chand Jain, Suman S. Thakur, Vijayalakshmi Ravindranath