Drosophila terminal system

By Levi Clancy for Student Reader on
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trunk torso active ligand inactive ligand embryogenesis

Torso is a receptor tyrosine kinase (aka Torso RTK) uniformly located in the oocyte's plasma membrane. Torso Ligand is produced by follicle cells and present only at the termini. Huckebein and Tailless are also involved.