In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Q: This structure was transplanted by Robert Briggs and Thomas King into a frog cell. The dye DAPI is used to stain this structure, which contains Cajal [kah-HAHL] bodies. Importins and exportins move molecules into and out of this structure, respectively. Intermediate filaments known as lamins line the inner surface of this structure, which is surrounded by a double membrane. One of its substructures includes a granular component and is a site of ribosome production. For 10 points, name this structure that contains DNA organized into chromosomes.
A:
Science