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In many gymnosperms and all angiosperms, the male gametophytes have been reduced to pollen grains and their antheridia have been reduced to a single generative cell within the pollen grain.
Indirect division or karyokinesis (karyomitosis) has been observed in all the tissues"generative cells, epithelial tissue, connective tissue, muscular tissue, and nerve tissue.
 See also: Vision, Sperm, Tissue, Cells, Division
  
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