Predicted to enable receptor signaling protein tyrosine kinase activator activity and receptor tyrosine kinase binding activity. Predicted to be involved in positive regulation of ERK1 and ERK2 cascade; positive regulation of ERK5 cascade; and positive regulation of neuron projection development. Predicted to be located in extracellular region. Orthologous to human ALKAL2 (ALK and LTK ligand 2). [provided by Alliance of Genome Resources, Apr 2022]