http://textbookofbacteriology.net/adaptive_2.html http://textbookofbacteriology.net/adaptive_2.html http://textbookofbacteriology.net/adaptive_2.html textbookofbacteriology.net http://textbookofbacteriology.net/adaptive_2.html http://textbookofbacteriology.net/adaptive_2.html http://textbookofbacteriology.net/adaptive_2.html