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.
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。
When an animal develops, embryos form three cellular or germ layers - ectoderm, endoderm and mesoderm - which then go on to form the body's organs and tissues.
当一个生物产生时，胚胎将形成三个胚层外胚层、内胚层和中胚层，然后再由这些胚层形成机体的组织和器官。
Primordial germ cells came from pole cells and moved in two masses to the laterodorsal abdomen of embryo, and then were enveloped by mesoderm to form germinal ridge.
原始生殖细胞来自极细胞，分两团移至胚胎腹部侧背面，被中胚层细胞包裹，形成生殖脊。
Primordial germ cells came from pole cells and moved in two masses to the laterodorsal abdomen of embryo, and then were enveloped by mesoderm to form germinal ridge.
原始生殖细胞来自极细胞，分两团移至胚胎腹部侧背面，被中胚层细胞包裹，形成生殖脊。
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