Predicted to enable several functions, including G protein-coupled serotonin receptor activity; calcium ion transmembrane transporter activity; and histamine binding activity. Acts upstream of or within memory; regulation of synaptic plasticity; and visual learning. Predicted to be located in cytosol and plasma membrane. Predicted to be active in dendrite. Predicted to be integral component of plasma membrane. Is expressed in brain; stomach; and uterus. Orthologous to human HRH1 (histamine receptor H1). [provided by Alliance of Genome Resources, Apr 2022]