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，制头尾部、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，可为部和腹部，两部细胞界清晰。

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、、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、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.

后腹径最长，可分为侧部和腹侧部，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.

果蝇胚胎发育种系统，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、前、后以及腹的形成。

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

后段的腹径最长，可分为和腹，两分的细胞分界清晰。