The accessory gland of male insects is a genital tissue that secretes many components of the ejaculatory fluid, some of which affect the female's receptivity to courtship and her rate of oviposition. This protein is expressed exclusively in the male accessory glands of adult Drosophila melanogaster. The proteins are transferred to the female fly during copulation and are rapidly altered in the female genital tract [1].

1: Structure and expression of a Drosophila male accessory gland gene whose product resembles a peptide pheromone precursor. Monsma SA, Wolfner MF; Genes Dev 1988;2:1063-1073. PMID:3142802