Xenbase Image ID: 134928

Fig. 16. Camera-lucida drawings of the positions of 16-cell clones in the vegetal hemisphere during gastrulation. In the top row clones of D2.2, V2.1, D1.2, and V1.1 are shown. In the bottom row clones of D1.1, D2.1, V2.2, and V1.2 are shown. At stage 10 (left), the four vegetal clones are in the positions of the original blastomeres. In addition D1.1 has moved from the animal hemisphere to form the dorsal lip of the blastopore (bottom, stippled). Note that cells from the D2.2 clone form the lateral edge of the lip (top, stippled) and that a few cells from the D2.1 clone are in the dorsal lip (bottom, white). At stage 11 (middle), the two lateral animal clones (D1.2, top; V1.2, bottom) have extended into the vegetal hemisphere and reached the blastopore lip. The D1.1 clone has undergone convergent extension to become a narrow midline stripe. At stage 12 (right), the dorsal clones have narrowed due to convergent extension and the ventral clones have spread over a larger surface area. A small portion of the V1.1 clone (top, black) approaches the ventral lip at the midline, but does not involute. Image published in: Bauer DV et al. (1994) Copyright © 1994. Image reproduced with permission of the publisher and the copyright holder. This is an Open Access article distributed under the terms of the Creative Commons Attribution License. Larger Image Printer Friendly View

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