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期已有了
,
4类
组成,即胚
(E
)、纤维
(F
)、泡状
(B
)和吸收
(R
)。