Plays an essential role in cuticle biogenesis. Required in combination with bli-3 for correct formation of cross-links in cuticle collagens. 2 a phenolic donor + H2O2 = 2 a phenolic radical donor + 2 H2O Expressed in the hypodermal cells, specifically the head and seam/body. Expressed in all adult and larval stages. Expression is cyclical and coincides with each of the larval molts, peaking at 12, 18, 24, and 30 hours post-hatching. Gross morphological abnormalities causing larval arrest with associated molt defects and low levels of embryonic lethality. Cuticle function and integrity are also impaired. Belongs to the peroxidase family.