ADVANCES IN DIAGNOSIS OF PAROXYSMAL DYSKINESIA Paroxysmal dyskinesias (PD) are a group of diseases of the CNS that produce abnormal movements occurring involuntarily and in episodes. So far, causative mutations have been found in BCNA in the CKCS with episodic falling and in PIGN in Soft Coated Wheaten Terriers with PD. This month two further mutations have been found by Paul Mandigers et co. in Markiesje dogs and by Jasmin Nessler et co. in Shetland Sheepdogs. The study is Markiesje dogs identi