Enables thrombin-activated receptor activity. Acts upstream of or within circulatory system development; endothelial to hematopoietic transition; and negative regulation of hematopoietic stem cell differentiation. Predicted to be located in membrane. Predicted to be active in plasma membrane. Is expressed in several structures, including cardiovascular system; digestive system; hematopoietic system; mesoderm; and pleuroperitoneal region. Orthologous to human F2R (coagulation factor II thrombin receptor).