This domain contains 8 conserved cysteine residues, but this family only contains 7 of them to overlaps with other domains. It is found in disease-related proteins including von Willebrand factor, Alpha tectorin, Zonadhesin and Mucin. It is often found on proteins containing pfam00094 and pfam01826.
Jiyao W et al.(2023). "The conserved domain database in 2023.",