In parentheses after each gene name are the salivary gland map location and the origin of the name. The PHENOTYPES section only lists bristle-related phenotypes (see Fig. 2.8). The PROTEIN section presents available data on function, length, subcellular location, domains, and binding partners. For further information, see FlyBase and The Interactive Fly.

Abbreviations: CS (chemosensory), DS (downstream in causation; “+” activated or “–” inhibited by US gene), GOF (gain of function), LOF (partial loss of function), MS (mechanosensory), US (upstream). Evidence for the hierarchical order of genes in a pathway (US or DS) is given from a DS perspective only. Protein domains are defined in Appendix 1. Numbers of repeats (e.g., “6x”) are in parentheses. Other genes whose embryonic mutant phenotypes suggest that they may belong to this group are BarH1 and BarH2. Certain sensilla campaniformia on the wing are transformed to bristles by ash2 (a member of the Trithorax Group of regulators; cf. Ch. 8).

absent solo-MD neurons and olfactory sensilla (amos, 36F; “MD” stands for multiple dendritic). Pathway: DS(+) of lozenge; interacts positively (dosedependent) with daughterless. PHENOTYPES: Null: unknown. LOF: fewer sensilla basiconica and trichodea on the antenna. GOF: extra sensilla basiconica, trichodea, and coeloconica on the antenna, ectopic olfactory sensilla elsewhere, and conversions of bristles into olfactory sensilla. PROTEIN: Function: transcription factor (198 a.a.). Location: unknown (presumably nuclear). Domains: bHLH (C-terminal).