http://purl.uniprot.org/unirules/MF_00869#construct-template-52 | http://spinrdf.org/sp#object | "The extracellular N-terminus has 4 domains; the first 3 are structurally similar to fusogens from plants, C.elegans and viruses, while the fourth domain is unique to archaea. Domains I and II are discontinuous. The fusion loop in domain II is stabilized by a Ca(2+) ion so that it protrudes from the molecule."xsd:string |