Expressed during a short window during embryogenesis between at least stages 12 and 19. Belongs to the NodC/HAS family. Probably inactive because it lacks critical residues conserved in other family members, including an Asp in the motif DSDT, which is NSDI in has-rs, and an Arg residue in the motif QXXRW, which is QQTPW in has-rs. Also inactive in the functional assays of PubMed:9442026.