This domain of unknown function is found in a putative tumour suppressor gene [1] and in a ligand for the the urokinase-type plasminogen activator receptor, which plays a role in cellular migration and adhesion [2,3].

1: DRO1, a gene down-regulated by oncogenes, mediates growth inhibition in colon and pancreatic cancer cells. Bommer GT, Jager C, Durr EM, Baehs S, Eichhorst ST, Brabletz T, Hu G, Frohlich T, Arnold G, Kress DC, Goke B, Fearon ER, Kolligs FT; J Biol Chem. 2005;280:7962-7975. PMID:15563452

2: Epileptic and developmental disorders of the speech cortex: ligand/receptor interaction of wild-type and mutant SRPX2 with the plasminogen activator receptor uPAR. Royer-Zemmour B, Ponsole-Lenfant M, Gara H, Roll P, Leveque C, Massacrier A, Ferracci G, Cillario J, Robaglia-Schlupp A, Vincentelli R, Cau P, Szepetowski P; Hum Mol Genet. 2008;17:3617-3630. PMID:18718938

3: Sushi repeat protein X-linked 2, a novel mediator of angiogenesis. Miljkovic-Licina M, Hammel P, Garrido-Urbani S, Bradfield PF, Szepetowski P, Imhof BA; FASEB J. 2009;23:4105-4116. PMID:19667118