Enables receptor ligand activity; transmembrane receptor protein tyrosine kinase activator activity; and vascular endothelial growth factor receptor 2 binding activity. Involved in several processes, including cell migration involved in sprouting angiogenesis; nephron epithelium morphogenesis; and positive regulation of macromolecule metabolic process. Acts upstream of or within several processes, including positive regulation of NF-kappaB transcription factor activity; positive regulation of branching involved in ureteric bud morphogenesis; and regulation of signal transduction. Located in extracellular space. Colocalizes with cell surface. Is expressed in several structures, including embryo mesenchyme; limb bud; neural ectoderm; sensory organ; and skeleton. Orthologous to human GREM1 (gremlin 1, DAN family BMP antagonist). [provided by Alliance of Genome Resources, Apr 2022]