Beta-hexosaminidase; Hexosaminidase 2 (Hexo2) encodes a beta-N-acetylglucosaminidase involved in carbohydrate metabolism.

Beta-hexosaminidase; Hexosaminidase 1 (Hexo1) encodes a beta-N-acetylglucosaminidase involved in protein deglycosylation and rhodopsin biosynthesis.

Chitin synthase activity. It is involved in the biological process described with: cuticle chitin biosynthetic process.

Putative ferric-chelate reductase 1 homolog; Putative ferric-chelate reductases reduce Fe(3+) to Fe(2+) before its transport from the endosome to the cytoplasm. Belongs to the FRRS1 family.

Krotzkopf verkehrt (kkv) encodes a membrane-inserted glycosyltransferase family 2 chitin synthase that uses GlcNAc to produce the polysaccharide chitin, which is extruded to the differentiating cuticle and tracheal system (tracheal cuticle, tube diameter regulation and gas filling).

Chitin deacetylase-like 4; Chitin binding. It is involved in the biological process described with: chitin metabolic process; carbohydrate metabolic process.

Uncharacterized protein, isoform G.

Obstructor-A, isoform A; obstructor-A (obst-A) encodes a protein that forms a core complex with chitin and the chitin modifying proteins encoded by serp and knk. This complex is required for assembly, maturation and preservation of the chitinous cuticles at the end of embryogenesis and probably throughout larval development.

Serpentine, isoform B; Serpentine (serp) encodes a putative chitin deacetylase. It is expressed by the epidermal and tracheal cells and is secreted into the apical extracellular space. Its activity maintains the strength of cuticles and restricts tracheal tube length.