title: First example of By phenotype.
abstract: In ABO blood grouping red cells of a young healthy woman behaved like O, but in her serum anti-B was lacking. By absorption-elution technique the very weak B activity was revealed. The saliva contained B and H substances, although the B to H ratio was significantly reduced, when compared to the normal B and Bm secretors. In the serum B transferase activity was not demonstrated. The presented results were comparable to those described in persons with Ay phenotype. Therefore, this weak B variant can be classified into By category.
authors.affiliation: Department of Serology, Institute of Haematology, Warszawa, Poland.
authors.forename: B
authors.initials: B
authors.lastname: Lenkiewicz
authors.forename: H
authors.initials: H
authors.lastname: Seyfried
mesh_terms: D000017:ABO Blood-Group System / Q000235:genetics* / Q000276:immunology; D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D010375:Pedigree; D010641:Phenotype
chemical_list: D000017:ABO Blood-Group System