A beta-sandwich domain exclusively found at the N-terminal of CHROMO domains in many Bdellovibrio proteins [1].

1: Evolutionary convergence and divergence in archaeal chromosomal proteins and Chromo-like domains from bacteria and eukaryotes. Kaur G, Iyer LM, Subramanian S, Aravind L; Sci Rep. 2018;8:6196. PMID:29670199