Involved in the chorion hardening process, through protein cross-linking mediated by the formation of di- and tri-tyrosine bonds. 2 a phenolic donor + H2O2 = 2 a phenolic radical donor + 2 H2O Binds 1 heme b (iron(II)-protoporphyrin IX) group per subunit. Belongs to the peroxidase family. XPO subfamily.