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Cover picture: Horizontal sections of E14.5 mouse retinae stained, by in situ hybridization, for (clockwise from top) the axon guidance receptors robo1 and robo2 and their ligands slit1, slit2 and slit3. The center panel shows immunofluorescence for Islet1, which marks the retinal ganglion cell layer. At this age, expression of both the receptors (robos) and ligands (slits) is restricted to this layer.