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To all those who purchased Through the Microscope after 5/23/2013. Your textbook is the 5th edition of Through the Microscope. Please navigate to the above link and log in there. If you purchased Through the Microscope before 5/23/2013, you purchased access to the 4th edition and you are on the correct site. The 4th edition will remain accessible until at least December of 2013. At that time it will be retired.
This is the third edition of Through the Microscope. A new edition has just been published. Please go to the Table of contents for the fourth edition