Contributes to cytokine binding activity. Acts upstream of or within peptidyl-tyrosine phosphorylation. Located in external side of plasma membrane. Part of interleukin-23 receptor complex. Is expressed in mandible; maxilla; orbito-sphenoid; rib; and testis. Human ortholog(s) of this gene implicated in immunodeficiency 30. Orthologous to human IL12RB1 (interleukin 12 receptor subunit beta 1). [provided by Alliance of Genome Resources, Apr 2022]