Evidence that urocortin is absent from neurons of the Edinger-Westphal nucleus in pigeons. J.A. Cavani, A. Reiner, S.L. Cuthbertson, J.C. Bittencourt and C.A.B. Toledo. Brazilian Journal of Medical and Biological Research, 36 (12): 1695, 2003.

Figure 2. Urocortin-containing neurons are not cholinergic. Digital image of fluorescence label for urocortin (A, UCN) and the enzyme choline acetyltransferase (B, ChAT). The brain level shown in A, B, and C corresponds to the caudalmost portion of the UCN+ main group, where the UCN+ cells are rare. ChAT neurons (arrowheads) are distinct and bigger than UCN neurons (arrows). The merged image (C) shows that the markers clearly do not localize in the same cell. At bottom right (D), a unilateral drawing of the location of the main UCN group as regarding the oculomotor nucleus (OM) and Edinger-Westphal nucleus (EWN) position is presented. Magnification bar: 50 µm.