Live from the thymus: T-cells on the move

For the first time, scientists follow the development of individual immune cells in a living zebrafish embryo. T-cells are the immune system's security force. They seek out pathogens and rogue cells in the body and put them out of action. Their precursors are formed in the bone marrow and migrate from there into the thymus. Here, they mature and differentiate to perform a variety of tasks. Scientists have now succeeded for the first time in observing the maturation of immune cells in live zebrafish embryos.

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