May play a role in sequestering potentially toxic fatty acids and their peroxidation products, or it may be involved in the maintenance of the impermeable lipid layer of the eggshell. From the hypodermis into the perivitelline fluid of the developing embryo prior to hatching. First detected in hypodermal precursor cells at the time of gastrulation. From the two-fold stage through to three-fold stages, expression is localized exclusively to hyp-7 but disappears in newly hatched L1s and subsequent developmental stages. Expression from L1 to adult stages is found in a single neuron in the ventral cord with a process into the nerve ring. Forms a beta-barrel structure that accommodates hydrophobic ligands in its interior. Belongs to the calycin superfamily. Fatty-acid binding protein (FABP) family.