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Found Mesoderm 2 times.

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1. Mesoderm
A middle layer of tissue in a developing animal embryo which will eventually become the muscles and other connective tissues, the blood vessels and blood cells (if any), and various other organs, structures, and systems (depends on the organism). Animals with this layer of tissue as an embryo are known as triploblast ic animals, which includes all animals except for sponges, placozoans, jellyfish, and comb jellies.

2. Mesoderm
The middle layer of cells in embryonic development; gives rise to muscles, bones, and structures associated with reproduction. The middle embryonic tissue layer. Cells and structures arising from the mesoderm include the bone, blood, muscle, skin, and reproductive organs.

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