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Unformatted text preview: , that is, they contain more than one nucleus. Teased skeletal muscle X 200 Note the many nuclei visible in the cell on the left. Chromatin is the grainy threadlike DNA. During cell division, the nuclear membrane disintegrates and the DNA becomes coiled producing visible structures called chromosomes . The material within the nucleus is referred to as the nucleoplasm . A double membrane ( nuclear envelope ) surrounds the nucleus. Nuclear pores allow materials to pass into and out of the nucleus....
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