原肠胚形成过程中，由上胚层细胞增殖产生的一部分细胞在上、下胚层之间形成的第三层细胞。通常形成骨骼、肌肉、结缔组织、心脏、造血系统、肾脏和其它器官。

Mesoderm --- The middle germ layer in the early embryo; the source of cells that go on to make bones, muscles, connective tissue, heart, hematopoietic system, kidney, and other organs.

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除了观察正常细胞的原肠胚形成，科学家们还观察了突变细胞。

In addition to looking at normal gastrulation, the scientists also looked at what happens to gastrulation when mutations occur.

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