title: How Botryllus chooses to fuse.
abstract: In Botryllus schlosseri, a highly polymorphic allorecognition system limits the potential for vascular fusion by genetically dissimilar, adjacent colonies. In this issue, Nyholm et al. (2006) uncover the nature of the receptor that recognizes the products of the histocompatibility genes.
authors.affiliation: Department of Pediatrics, University of South Florida College of Medicine, St. Petersburg, 33701, USA.
authors.forename: Gary W
authors.initials: GW
authors.lastname: Litman
mesh_terms: D000818:Animals; D015870:Gene Expression; D006649:Histocompatibility Antigens / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D011506:Proteins / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D014561:Urochordata / Q000737:chemistry / Q000166:cytology / Q000276:immunology* / Q000378:metabolism*
chemical_list: D006649:Histocompatibility Antigens; D011506:Proteins