础
In the posterior segment, its dorsoventral axis was the longest, and could be divided into two parts: the dorsal and the ventral parts.
后段
背腹径最长，可分为背侧部和腹侧部，两部分细胞分界清晰。
In the posterior segment, its dorsoventral axis was the longest, and could be divided into two parts: the dorsal and the ventral parts.
后段背腹径最长，可分为背侧部和腹侧部，两部分细胞分界清晰。
The dorsoventral polarity of Drosophila egg is established by means of signaling between the germ line-derived oocyte and the surrounding somatic follicle cells.
果蝇胚胎发育是由四种系统，分别控制头尾部、前部、后部以及背腹部形成。
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