Predicted to enable calcium ion binding activity and heparin binding activity. Predicted to be involved in several processes, including endothelial cell differentiation; endothelial cell migration; and regulation of BMP signaling pathway. Predicted to act upstream of or within hematopoietic stem cell homeostasis. Predicted to be located in extracellular region. Orthologous to human FSTL1 (follistatin like 1). [provided by Alliance of Genome Resources, Apr 2022]