This is a 6th edition of Biochemistry by Stryer. I used it last semester for Biochem 415 and the content did not vary enough to make a difference between the newer 7th edition versus this one. There is nearly no writing/highlighting in the book and overall it is in pretty good condition. Just some minor wear on the binding. The total cost will be $30 plus a $10 shipping fee (I'm not in the AA area for the summer so I will have to ship it)