Human Cell Differentiation Molecules, an organisation which runs HLDA (Human Leucocyte Differentiation Antigens) Workshops and names and characterises CD molecules.

The mission of HCDM is to characterise the structure, function and distribution of leucocyte surface molecules and other molecules of the immune system. 

The next HLDA Workshop, HLDA9, will be Chaired by Pablo Engel, Immunology Unit. Department of Cellular Biology, Immunology and Neurosciences. Medical School; University of Barcelona. Casanova 143. Barcelona E-08036. The conference for the HLDA9 Workshop will be held in Barcelona, Spain, from 11-13 March, 2010. UPDATE: The website for the HLDA9 Conference has launched. For information about the conference, please go to hlda9conference.org.
Information on the CD molecules can be found on this website, and in the book "Leukocyte and Stromal Cell Molecules: The CD Markers", published by John Wiley and Sons.