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http://www.genetics.org/cgi/content/abstract/170/2/631
http://jb.asm.org/cgi/content/abstract/187/13/4607
http://www.annalsnyas.org/cgi/content/abstract/1042/1/88?ct
http://www.genetics.org/cgi/content/abstract/170/2/631
http://jb.asm.org/cgi/content/abstract/187/13/4607
http://www.annalsnyas.org/cgi/content/abstract/1042/1/88?ct