There are 5 stages during the development of embryo, including the stage of 2-celled proembryo, multicellular proembryo, globular proembryo, pyriform proembryo, differential embryo and mature embryo.

胚胎发育经过二细胚、多细胚、胚、梨胚、分化胚和成熟胚阶段。

Granulocytic sarcoma (GS), also known as extramedullary myeloblastoma or chloroma is an unusual manifestation and represent soft tissue masses composed of immature cells of the granulocytic series.

粒性白血肉也称为骨髓胚细绿色，是一种少见的疾病。

The midgut gland cell differentiation occurs at Z2, There are 4 types of cells, i. e., embryonic cell (E-cell), fibrillar cell (F-cell), blister cell (B-cell) and resorptive cell(R-cell).

中肠腺小管上皮在Z2期细已有了分化，由4类细组成，即胚细(E细)、纤维细(F细)、泡状细(B细)和吸收细(R细)。