Predicted to enable calcium ion binding activity and heparin binding activity. Involved in endothelial cell differentiation; endothelial cell migration; and negative regulation of apoptotic process. Acts upstream of or within hematopoietic stem cell homeostasis. Located in extracellular space. Is expressed in several structures, including brain; cardiovascular system; genitourinary system; limb; and sensory organ. Orthologous to human FSTL1 (follistatin like 1). [provided by Alliance of Genome Resources, Apr 2022]