Many of the proteins in this family contain multiple similar copies of this plastocyanin-like domain.

1: The blue oxidases, ascorbate oxidase, laccase and ceruloplasmin. Modelling and structural relationships. Messerschmidt A, Huber R; Eur J Biochem 1990;187:341-352. PMID:2404764

2: Refined crystal structure of ascorbate oxidase at 1.9 A resolution. Messerschmidt A, Ladenstein R, Huber R, Bolognesi M, Avigliano L, Petruzzelli R, Rossi A, Finazzi-Agro A; J Mol Biol 1992;224:179-205. PMID:1548698