Roundabout 1 (robo1) encodes a member of the Robo receptor family that uses the secreted glycoprotein encoded by sli as ligand and the products of Sdc and Dscam1 as co-receptors. It contributes to axon guidance and dendrite morphogenesis as well as regulating trachea and heart tube development.

Netrin receptor unc-5; Receptor for netrin required for motor axon guidance. Mediates both short- and long-range axon motor repulsion in the developing nervous system upon ligand binding. Also involved in glial migration. While short-range repulsion requires both fra and unc-5, long-range repulsion only requires unc-5.

Slit (sli) encodes a secreted glycoprotein that acts as a ligand for the Robo receptor family and co-receptors, including the products of Sdc and Dscam1. The product of sli functions as second messenger (via Abl) and receptor dependent, providing repellent (neural growth cone), attractive (trachea), and polarising (cardioblasts) cues for differentiating cells.

Caspase-8 subunit p10; Effector of the programmed cell death (PCD) activators rpr, grim and hid. May play an apoptotic role in the germline as well as soma. Fadd interacts with Dredd to promote cleavage of Dredd and is necessary and sufficient for enhancing Dredd-induced apoptosis. Plays a role in the innate immune response. Required for resistance to Gram-negative bacterial infection. Diap2-mediated ubiquitination of Dredd is critical for processing of imd and rel and the subsequent expression of antimicrobial genes such as DptA. Belongs to the peptidase C14A family.

LanB1 (LanB1) encodes a subunit of laminin, a heterotrimeric protein found in the extracellular matrix (ECM) and a major component of the basal lamina. Laminins interact with a variety of cell surface molecules such as integrin receptors and other secreted ECM components. It contributes to ECM organization, tissue adhesion, cell motility and developmental patterning.

E3 ubiquitin-protein ligase TRIM9; E3 ubiquitin-protein ligase activity (By similarity). During embryonic and larval development, regulates the pattern of axonal projections of class IV nociceptive sensory neurons (C4da) downstream of netrin receptor fra. Regulates fine-scale topography of C4da axon terminals upon neuronal activity. During eye development, consolidates the attachment of R8 photoreceptor growth cones to the target medulla layer, probably downstream of fra. Belongs to the TRIM/RBCC family.

Moesin/ezrin/radixin homolog 1; Involved in connections of major cytoskeletal structures to the plasma membrane. Together with wgn, involved in control of axon targeting of R8 and R2-R5 photoreceptors, independent of egr. In the nucleus, recruited to sites of active transcription by RNA polymerase II where it has a role in nuclear mRNA export together with the mRNA export factor PCID2 and other messenger ribonucleoprotein (mRNP) particles.

Tyrosine-protein kinase Abl; Arm and Abl proteins function cooperatively at adherens junctions in both the CNS and epidermis; critical for embryonic epithelial morphogenesis regulating cell shape changes and cell migration. Plays a critical role in transducing embryonic midline repulsive cues; may regulate cytoskeletal dynamics underlying a growth cone's response to midline cues. The ability of pCC/MP2 axons to correctly interpret midline repulsive cues and stay on the ipsilateral side is dependent on the strength of both Slit/robo and Abl-dependent signaling pathways.

Netrin-A; Netrins control guidance of CNS commissural axons at the midline and peripheral motor axons to their target muscles.