I just got a magazine from the veterinary teaching hospital at Illinois (Urbana-Champaign). Dr. Dominique Griffon is doing a multi-dimensional study on CCL deficiency, and is looking for purebred labs with and without ccl problems to participate. If you are nearby and interested, here a link for more info.
http://www.cvm.uiuc.edu/vth/MedServices/ClinicalTrial/PDF/Orthopedic/cclannounce.pdf |