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Type  developmental stage Description  Embryonic expression was first detected in the node at 7.5 dpc. By early somite stages, expression extends anteriorly along the entire length of the notochord and is expressed in the dorsal neural tube from the caudal hindbrain to the posterior-most region of the embryo. By the time cranial tube closure is completed expression is continuous along most of the dorsal midline of the neural tube, to its rostral termination at the base of the forebrain. Expression in the neural tube and caudal notochord remains unchanged during early organogenesis from 9.5 dpc to 10.5 dpc.