J.W. SHULER / SCIENCE PHOTO LIBRARY J.W. SHULER / SCIENCE PHOTO LIBRARY
Cell division. Fluorescent light micrograph of an epithelial cell during mitotic cell division. DNA genetic material is blue and microtubule strands are green. The pink dots show the protein Mad2, which is a spindle assembly checkpoint protein. The spindle is the array of green microtubules stretching between the two poles at centre left and right. It is the apparatus by which the chromosomes are pulled apart, eventually forming the nuclei of the daughter cells. Once the chromosomes have divided along the spindle, the cell starts to divide. Magnification: x6500 at 6x9cm size.
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