Enables leukotriene receptor activity. Involved in inflammatory response; positive regulation of angiogenesis; and positive regulation of vasoconstriction. Predicted to be integral component of plasma membrane. Used to study pulmonary hypertension. Biomarker of pulmonary fibrosis. Human ortholog(s) of this gene implicated in allergic disease; asthma; and rhinitis. Orthologous to human CYSLTR1 (cysteinyl leukotriene receptor 1). [provided by Alliance of Genome Resources, Apr 2022]