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、部、后部以及背腹部形成。

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。

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.

果蝇胚胎的发育是由四种系统，分别控制头尾部、前部、后部以及背腹部的形成。

In the posterior segment, its dorsoventral axis was the longest, and could be divided into two parts: the dorsal and the ventral parts.

后段的背腹径，分为背侧部和腹侧部，两部分的细胞分界清晰。

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。

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。

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.

果蝇胚胎的发育是由四种系统，分别控制头尾部、前部、后部以及腹部的形成。

In the posterior segment, its dorsoventral axis was the longest, and could be divided into two parts: the dorsal and the ventral parts.

后段的腹，可分为侧部和腹侧部，两部分的细胞分界清晰。

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，分头尾部、前部、后部以及腹部形成。

In the posterior segment, its dorsoventral axis was the longest, and could be divided into two parts: the dorsal and the ventral parts.

后段腹径最长，可分为部和腹部，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.

果蝇胚胎的发育是由四种系统，分别控制头尾、、以及背腹的形成。

In the posterior segment, its dorsoventral axis was the longest, and could be divided into two parts: the dorsal and the ventral parts.

段的背腹径最长，可分为背侧和腹侧，两分的细胞分界清晰。

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、部以及背腹部形成。

In the posterior segment, its dorsoventral axis was the longest, and could be divided into two parts: the dorsal and the ventral parts.

背腹径最长，可分为背侧部和腹侧部，两部分细胞分界清晰。