Prophase is the first stage of mitosis during which chromosomes condense and become visible under light microscopy; spindle fibers form and the nuclear envelope breaks down.
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These are thread-like structures located inside the nucleus of animal and plant cells. Each chromosome is made of protein and a single molecule of DNA.
Spindle Fibers: These are proteins that divide genetic material in a cell. They help pull apart the cell during replication and are necessary for cell division.