Each of the four nitrogenous bases comes in a different unlabeled color. You can assemble the model and then twist it into a double helix, instead of building it around a center post as in other models. The model is removable from the plastic base and can be extended to its full length to demonstrate strand separation.
Location: Main Circulation Desk (SRC, Library, 2nd Floor)
URL: http://cod.worldcat.org/oclc/700634613
Number available: 1