Professor Curt Wittenberg, a molecular geneticist at Scripps Research Institute and an SDJA parent, came in to do a lab with the students. They separated pieces of DNA using gel electrophoresis. The students learned how to calculate the sizes of DNA fragments based on the distances that they travel in the gel. It was a great opportunity for the kids to see and perform a sophisticated lab technique that is used in crime scene investigations, paternity tests, medicine, and genetic research.

老外教你跑胶（琼脂糖凝胶电泳）