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)。

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.

颗粒性白血球肉也称为骨髓胚细色，是一种少见的疾病。

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.

胚胎发育经过二细原胚、多细原胚、球形原胚、梨形原胚、分化胚和成熟胚阶段。