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Fig. 20. Characteristics of lineage 18. (A) Ventral view of the projection of a MARCM clone of lineage 18 in T2. (B) A mid-sagittal section through the dorsal (Dor), intermediate (Inter) and ventral (Vent) commissural bundles in T1-A1. The neurite bundles for lineages 18 and 10 make up the region of the aI commissure immediately anterior to the ascending bundles from lineage 2. Bundle 18 is absent from T1 whereas bundle 10 is absent in A1. (C) A ventral view of a thick section of the Neurotactin scaffold at the level of the intermediate commissures. There is no lineage 18 bundle in the aI commissure in T1, whereas it is present in the corresponding commissure in posterior neuromeres (brackets). Numbers identify neurite bundles from other lineages. Diagrams as in Fig. 2.