“…As in amphibians, diversity exists with regard to the presence of CR in bulbar cells of fish because both interneurons and mitral cells contain CR in lampreys [Pombal et al, 2002] and some teleosts [Porteros et al, 1997;Díaz-Regueira and Anadón, 2000], whereas only scarce CRir interneurons were demonstrated in a chondostrean fish [Huesa et al, 2006] and no CRir cells were detected in the zebrafish and catfish olfactory bulbs [Castro et al, 2006;Jadhao and Malz, 2007]. The numerous studies conducted in different mammalian species also show enormous diversity in the content of CB and CR in bulbar cell populations [Alonso et al, 1993[Alonso et al, , 1995Malz et al, 2000;Jia and Halpern, 2004;Parrish-Aungst et al, 2007]. However, it is a shared feature that the periglomerular cells are always rich in CB and CR [Briñón et al, 1992;Alonso et al, 1993;Toida et al, 1998;Kakuta et al, 2001;Jia and Halpern, 2004;Kosaka and Kosaka, 2007], whereas species differences exist regarding the localization of these proteins in granule cells [Kakuta et al, 2001;Jia and Halpern, 2004].…”