The disappearance of TIP39 fibers following lesioning TIP39 neurons in the rat. A: Unilateral lesions of the PVG resulted in the ipsilateral disappearance of TIP39 fibers in the lateral septal nucleus. B: The density of TIP39-ir fibers is markedly reduced in the hypothalamic paraventricular nucleus ipsilateral to a lesion in the PIL. C: The dense network of TIP39 fibers in the external cortex of the inferior colliculus disappears ipsilateral to a lesion of the MPL. Panels B, C, and E are modifications of our previously published figures (Dobolyi et al., 2003a). Abbreviations: ac, anterior commissure; f, fornix; IC, inferior colliculus; LS, lateral septal nucleus; LV, lateral ventricle; PVN, hypothalamic paraventricular nucleus; 3V, third ventricle; 4V, fourth ventricle. Scale bar = 400 μm for A, 200 μm for B, and 500 μm for C.