Cells are the smallest unit of life. Cells in multicellular plants and animals are arranged into tissues, organs and organ systems. Cells. Tissues. Organs. Organ systems. And the organism itself.
Image 2. Example of optogenetics-guided tissue folding. The top image shows an embryo 10 minutes after illumination, and the bottom one 13 minutes afterwards: light-activated cells have folded inwards ...
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