Swiss:P17554 contains a vwd domain. Its function is unrelated but the similarity is very strong by several methods. This domain is structurally homologous to the C-terminal domain of repulsive guidance molecules (RGM) despite low sequence identity [2].

1: The modular architecture of a new family of growth regulators related to connective tissue growth factor. Bork P; FEBS Lett 1993;327:125-130. PMID:7687569

2: The von Willebrand factor D'D3 assembly and structural principles for factor VIII binding and concatemer biogenesis. Dong X, Leksa NC, Chhabra ES, Arndt JW, Lu Q, Knockenhauer KE, Peters RT, Springer TA; Blood. 2019;133:1523-1533. PMID:30642920