Acts as a surfactant (PubMed:24442854, PubMed:18689424). Is the major protein constituent (45%) of foam nests (PubMed:27460953). Has no antimicrobial activity, no larvicidal activity, and is not toxic to mice (PubMed:18689424). Stable between 25 and 95 degrees Celsius. Monomer. Exclusively expressed in females in the early oviduct, the glandular part of the oviduct (pars convoluta dilata) and in the cloaca. Mass spectrometry data suggest sequence microheterogeneity hinting at the existence of several isoforms.