Enables substance K receptor activity. Involved in several processes, including operant conditioning; positive regulation of uterine smooth muscle contraction; and regulation of secretion by cell. Located in membrane. Used to study colitis and pulmonary hypertension. Biomarker of colitis. Human ortholog(s) of this gene implicated in asthma. Orthologous to human TACR2 (tachykinin receptor 2). [provided by Alliance of Genome Resources, Apr 2022]