Protein enhancer of sevenless 2B; Downstream of receptor kinase (drk) encodes an adaptor protein that recognizes phosphorylated tyrosine residues of membrane receptors and triggers the Ras/Raf/MAPK pathway. drk product contributes to the regulation of cytoskeletal organization and participates in developmental and cognitive processes (associative learning, anesthesia resistant memory).

Protein sevenless; Receptor for an extracellular signal required to instruct a cell to differentiate into an R7 photoreceptor. The ligand for sev is the boss (bride of sevenless) protein on the surface of the neighboring R8 cell.

Protein son of sevenless; Promotes the exchange of Ras-bound GDP by GTP. Functions in signaling pathways initiated by the sevenless and epidermal growth factor receptor tyrosine kinases; implies a role for the ras pathway in neuronal development.

Epidermal growth factor receptor; Binds to four ligands: Spitz, Gurken, Vein and Argos, which is an antagonist. Transduces the signal through the ras-raf-MAPK pathway. Involved in a myriad of developmental decisions. Critical for the proliferation of imaginal tissues, and for the determination of both the antero-posterior and dorso-ventral polarities of the oocyte. In the embryo, plays a role in the establishment of ventral cell fates, maintenance of amnioserosa and ventral neuroectodermal cells, germ band retraction, cell fate specification in the central nervous system and production [...]

Tyrosine-protein kinase receptor torso; Probable receptor tyrosine kinase which is required for determination of anterior and posterior terminal structures in the embryo. During postembryonic development, involved in the initiation of metamorphosis probably by inducing the production of ecdysone in response to prothoracicotropic hormone Ptth. Binding to Ptth stimulates activation of canonical MAPK signaling leading to ERK phosphorylation (By similarity).

Ras-like protein 1; Ras proteins bind GDP/GTP and possess intrinsic GTPase activity (By similarity). Plays a role in eye development by regulating cell growth, survival of postmitotic ommatidial cells and differentiation of photoreceptor cells. During larval development, mediates Ptth/tor signaling leading to the production of ecdysone, a hormone required for the initiation of metamorphosis.

Insulin receptor substrate 1; Activates phosphatidylinositol 3-kinase when bound to the regulatory p85 subunit (By similarity). May mediate the control of various cellular processes by insulin-like peptides. When phosphorylated by the insulin receptor binds specifically to various cellular proteins containing SH2 domains. Involved in control of cell proliferation, cell size, and body and organ growth throughout development. Also has a role in a signaling pathway controlling the physiological response required to endure periods of low nutrient conditions. Insulin/insulin-like growth fac [...]

Kinase suppressor of ras (ksr) encodes a MAP-kinase scaffold protein. It mediates the activation of the serine/threonine kinase encoded by Dsor1.

GTPase-activating protein; Inhibitory regulator of the Ras-cyclic AMP pathway. May function as a negative regulator of Ras85D/Ras1 in the sev signaling pathway. Acts cell autonomously in cone cell precursors as a negative regulator of R7 photoreceptor cell determination.