Hi, It would be nice if the search results can put the articles from the same thread together so that one can read the whole discussion of the question. Thank you very much! Best regards, Fai -- Yuk Fai Leung Department of Molecular and Cellular Biology Harvard University BL 2079, 16 Divinity Avenue Cambridge, MA 02138 Tel: 617-495-2599 Fax: 617-496-3321 email: yfleung@mcb.harvard.edu; yfleung@genomicshome.com URL: http://genomicshome.com