The 7th International Workshop on Human Leucocyte Differentiation Antigens (HLDA7) studied a number of newly characterised molecules relevant to human leucocyte differentiation and function. The HLDA organisation, which devised and continues to maintain the CD nomenclature, is responsible, under the auspices of IUIS and WHO, for the nomenclature of all leucocyte differentiation markers. The 7th Workshop redefined a number of (principally carbohydrate) molecules, and assigned CD names to approximately 80 new molecules. This update lists, in tabular form, the redefined and newly assigned names, together with antibodies, which have been confirmed under Workshop conditions as specific for the new and redefined molecules. The major features of the cellular expression patterns are summarised, and a LocusLink accession number provided to enable the reader to access more detailed information through http://www.ncbi.nlm.nih.gov/LocusLink.