Monday, 11 November 2013

SEM of a human embryo at day 4.


SEM of a human embryo at day 4. The protein coat surrounding the egg (zona pellucida, gold) has been slit to expose the embryonic cells inside (red). These cells go on to form the embryo and can be harvested and cultured to give rise to embryonic stem (ES) cells. Microvilli are visible on the surface of the embryonic cells (blastomeres) and numerous sperm (blue) are still visible on the outside of the zona pellucida.

Credit: Yorgos Nikas, Wellcome Images
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4 comments:

  1. kw shen11 November 2013 at 03:34

    这是照片吗？

    ReplyDelete
  2. Rhonda Roberts11 November 2013 at 05:55

    my first nephew was just born and it's amazing to think that this was the first step!

    ReplyDelete
  3. Nick Irvine11 November 2013 at 06:48

    Wow... just wow! I will definitely be sharing this with my students when we hit meiosis & mitosis

    ReplyDelete
  4. Roy Bowman11 November 2013 at 07:22

    Absolutely the Best !

    ReplyDelete