ten Dijke, P.; Ichijo, H.; Franzen, P.; Schulz, P.; Saras, J.; Toyoshima, H.; Heldin, C.H.; Miyazono, K.
Activin receptor-like kinases: a novel subclass of cell-surface receptors with predicted serine/threonine kinase activity (1993), Oncogene, 8, 2879-2887.