Members of this family of fungal domains are functionally uncharacterised. They may act as toxins [1].

1: Solving the structure of the bubble protein using the anomalous sulfur signal from single-crystal in-house Cu Kalpha diffraction data only. Olsen JG, Flensburg C, Olsen O, Bricogne G, Henriksen A; Acta Crystallogr D Biol Crystallogr. 2004;60:250-255. PMID:14747700