Studying how embryos develop and turn into fetuses as well as how they develop the different parts of the human body especially in the early weeks may be very tricky, partly because there's no way for us to measure or observe them as they develop.
However, a team of scientists has now been able to trace the expression of genes and differentiation of individual cells in order to understand how human limbs form and develop.
The video above shows a reconstructed version of how fingers form based on the map of human limb development the scientists created.
(Video credit: Wellcome Sanger Institute/Youtube)
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