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    Chicken embryo vascular system Vincent Pasque / University of Cambridge This fluorescence micrograph shows the vascular system of a developing chicken embryo (Gallus gallus), two days after fertilisation. Injecting fluorescent dextran revealed the entire vasculature used by the embryo to feed itself from the rich underlying yolk inside the egg. At this stage of development, the embryo and its surrounding vasculature are a little smaller than a 5p coin.

    Chicken embryo vascular system

    Embryo cell junction.

    Human embryo at day four | Image Editor Scanning electron micrograph 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.

    Agate w/ Druzy Quartz

    16-cell human embryo on a pin, SEM, scanning electron microscope picture of the beginning stages of a cell.

    Tourmaline & Smoky Quartz

    Malachite

    Stalactite.

    The Witch Head is a favorite around Halloween and is located in the constellation Orion, near the bright star Rigel.

    NASA's MESSENGER Satellite Captures Spectacular Color Mosaic of Mercury by NASA Goddard Photo and Video, via Flickr

    Immune system fighting a cancer cell. A killer T-lymphocyte (orange) inducing a cancer cell to undergo Programmed Cell Death.

    Amethyst

    City Lights Illuminate the Nile by NASA Goddard Photo and Video, via Flickr

    Meteor shower

    Farewell, Atlantis (NASA, International Space Station, 07/19/11) by NASA's Marshall Space Flight Center, via Flickr

    neurons in the brain

    New beginnings by Gina Glover: This is one of six photographs that show images of blossoms contained within the initial stages of human pre-implantation development. #Photography #Gina_Glover #Embryo

    Nerve cells. Coloured scanning electron micrograph (SEM) of nerve cells, showing cell bodies (pink) and extensions called axons and dendrites (purple). Neurons are responsible for passing information around the central nervous system (CNS) and from the CNS to the rest of the body.

    Peacock mite: scanning electron micrograph at 260X magnification