Phalene Dog (IMAGE) University of Helsinki Caption PRA is one of the most common causes of blindness in dogs and in human. The mutation in Phalene and Papillon dogs was found in the gene, which has been linked to corresponding human retinal degeneration earlier. Credit Photo: Kaisa Kuutti Usage Restrictions The image may only be used with appropriate caption or credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.