Required for normal photoreceptor differentiation between Ras and Raf for EGFR signaling in the eye and for mitogen-activated protein kinase phosphorylation. Probably acts together with Cnk to promote Raf activation, perhaps by recruiting an activating kinase. Interacts with the SAM domain of cnk. Expressed ubiquitously throughout development. 'Aveugle' means 'blind' in French.