Cover picture: Schematic diagram of a subset of nuclei in the zebra finch song system. When the bidirectional tracer dextran amine, conjugated to two different fluorphores, was injected into corresponding regions of nucleus lMAN and area X, retrogradely labeled neurons (green) in the thalamic nucleus DLM were surrounded by anterogradely labeled terminals (red). The topographic relations of the three projections in this loop are thus in register. For details, see the article by Luo et al. in this issue (pages 6836-6845).