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Sensory neurons of the embryonic mouse trigeminal ganglion are transiently supported by brain-derived neurotrophic factor (BDNF), neurotrophin-3 (NT3), and NT4/5 during the earliest stages of target field innervation before they become dependent on nerve growth factor (NGF) for survival. To determine whether the switch from BDNF/NT3/NT4/5 dependence to NGF dependence occurs autonomously in these n
