Examples of domains in new X- and H-groups assigned by manual curation in ECOD . Examples of domains in new X- and H-groups assigned by manual curation in ECOD. (A) Novel reticulocyte-binding protein homologue (RH) domain PfRH5 (e4u1gA1) did not pass automatic classification and was used as the seed for a new X-group. A subsequent domain from Plasmodium vivax was added to this new X-group automatically. (B) Pumala hantavirus (PUUV) Gn polyprotein was divided into three domains, 2 of which were novel, by manual curation. (C) A novel mitoribosomal subunit, ms22, contains biomedically relevant mutation sites and was recently classified along with other novel mitoribosomal structures.