Dec. 18, 2024 — Scientists have generated human stem cell models which contain notochord -- a tissue in the developing embryo that acts like a navigation system, directing cells where to build ...

We cycle through these stages several times throughout ... neurotransmitters – chemicals carrying messages between nerve cells – that stop us from physically acting out our dreams and ...

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Only two people survived the crash, which happened as the plane was landing at an airport in the southwest. Officials said they were investigating the cause. The site of the crash in the evening ...

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Receptors are groups of specialised cells. They detect a change in the environment (stimulus) and stimulate electrical impulses in response. Sense organs contain groups of receptors that respond ...