Plays an important role in primordial germ cell (PGC) maintenance and efficiency of PGC migration. Enriched in the mitochondrial cloud of stage I oocytes, before becoming concentrated at the tip of the vegetal cortex in stage II oocytes. Expression becomes localized to the germ plasm of stage III-IV oocytes and early cleavage stages. At the tailbud stage, localizes to the migrating primordial germ cells (PGCs) until PGC migration is complete (stage 40), at which point expression disappears. In the adult, expressed in the brain, ovary, eye, muscle, spinal cord and very weakly in adipocytes. Expressed maternally. Prominent in the egg and during early cleavage stages. Expression decreases slightly between neurula and late tailbud stage before elevating again at the tadpole stages. Belongs to the GRIP2 family.