... transduction, but express guanylate cyclase-D (GC-D). These GC-D-positive (GC-D + ) neurons are not known to express odorant receptors. Axons of GC-D + neurons project to the necklace glomeruli, which reside between the main and accessory olfactory bulbs. To label the subset of necklace glomeruli that receive...

... that the association between an NO- sensitive guanylate cyclase and synaptogenesis is an ancient one, as evidenced by its presence in both ancient and more recently evolved insect groups. * Author for correspondence at permanent address: Department of Zoology, University of Washington, Box 351800, Seattle, WA...