[i] This table lists all 51 odorant-binding protein genes described in this paper along with their cytological positions and previous names where applicable. Previous names are: PBPRP(pheromone-binding protein related protein gene, Pikielny et al. 1994), OS (olfactory-specific gene, McKenna et al. 1994),LUSH (Kim et al. 1998), CG (computational gene,Flybase 1999), and OBP (odorant-binding protein gene,Galindo and Smith 2001). We have modified annotations to some of theCG and OBP genes as indicated by the suffix “.m.” Clot # is the Berkeley Drosophila Genome Project designation for a set of homologous Drosophila expressed sequence tags (dESTs) likely to come from the same gene. Many of theDrosophila Obp genes are expressed in one or more chemosensory organs: antenna (A), maxillary palp (M), proboscis (P), other adult chemosensory (O), or larval chemosensory organ (L). N indicates that no expression in adult heads (i.e., A, M, or P) was seen. Expression data are from: ¹ Pikielny et al. 1994,² McKenna et al. 1994, ³ Kim et al. 1998,⁴ Galindo and Smith 2001, and/or ⁵this study.