ON THE INNER BACK COVER: With liquid crystal polarized light microscopy, spindle microtubules exhibit striking birefringence, which is color enhanced using the ‘Red Hot’ lookup table in Image J software. This flattened spermatocyte failed to divide after meiosis I and now has both of the two spindles for meiosis II in its lone cytoplasmic space.

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内封底图片

内封底：通过液晶偏振光显微镜，纺锤体微管表现出惊人的双折射，并使用 Image J 软件中的“Red Hot”查找表增强了颜色。这种扁平的精母细胞在减数分裂 I 后未能分裂，现在在其单独的细胞质空间中具有减数分裂 II 的两个纺锤体。