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This site contains several animations that can be viewed online or downloaded for presentations. The animations typically allow the user to control the reaction by requiring them to hit a button to begin each step or move to the next step. There is also a repeat button if any review is needed. The polymerase chain reaction is presented in easy to follow illustrations and goes through three cycles. It is followed by a user-generated graph of copy number versus cycle that uses data from many more cycles. The gel analysis of polymorphisms, the application of pcr that follows, is likely to be unclear and confusing to the novice. The Southern Blot animation is presented as a scenario that collects data that the user is asked to interpret. Cycle sequencing is an animation of DNA sequencing and interpretation of electrophergrams. BOth of these animations are quite well done. DNA Detectives presents three true cases, two on paternity and one murder/rape, for the user to solve using DNA fingerprint data.They are rather simple to do. AcDs is nothing more than a basic discussion of jumping genes and the animation adds very little. Three Polymorphisms appeared only as three diagrams without any animations, so I am not sure what its purpose was.