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Main markers involved in the early thalamic prepatterning. Schemes of lateral views of the forebrain at early and late embryonic stages representing the main expressed factors that lead in Xenopus to a first induction of the thalamic region and the position of the Zli (A), and the subsequent prepatterning of the thalamus and formation of the Zli (B). The prethalamo-thalamic boundary (PTB) can be inferred in the zone where the rostral and caudal expressions abut.
