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. Author manuscript; available in PMC: 2021 Nov 1.
Published in final edited form as: Curr Top Dev Biol. 2020 Jan 11;136:167–193. doi: 10.1016/bs.ctdb.2019.11.014

Figure 1. Cell rearrangements during Drosophila germband extension.

Figure 1.

(A) Convergent extension in the germband ectoderm (gray) elongates the anterior-posterior (AP) body axis. (B) T1 processes occur through the contraction of a single vertical cell interface. (C) Multicellular rosettes form through the contraction of 2 interfaces (for a 5-cell rosette), 3 interfaces (for a 6-cell rosette), or 4 or more interfaces (for rosettes containing 7 or more cells). (D) The germband ectoderm is a simple columnar epithelium. (E) An en face view of showing one hexagonal cell and its neighbors. (F) Cross-sectional view showing different cellular domains along the apical-basal axis.