This is a family of largely microsporidia-specific proteins with an aberrant zinc-finger motif of Cx(4)C2H repeated.

1: Reduction and expansion in microsporidian genome evolution: new insights from comparative genomics. Nakjang S, Williams TA, Heinz E, Watson AK, Foster PG, Sendra KM, Heaps SE, Hirt RP, Martin Embley T; Genome Biol Evol. 2013;5:2285-2303. PMID:24259309