Predicted to enable transforming growth factor beta binding activity. Acts upstream of or within several processes, including animal organ development; negative regulation of osteoblast differentiation; and regulation of BMP signaling pathway. Located in extracellular space. Is expressed in several structures, including brain; genitourinary system; gut; sensory organ; and skeleton. Orthologous to human TWSG1 (twisted gastrulation BMP signaling modulator 1). [provided by Alliance of Genome Resources, Apr 2022]