I know I have done alot of reading on it lately, and more and more texts refer to it as a propable genetic condition. However, no specific genes have been found or seperated but it does have a large tendency to run in the same lines and families.
Just as a disclaimer, I have never had a dog suffer from it and neither of my current dogs have or have had pano. This is just yet another subject I am interested in and would like to know more thoughts and studies. 
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SBD Posejpal's Leyna, HCTs 6/16/2010
SBD Posejpal's Hades, 5/9/12
At the rainbow bridge:
Zappa 12/27/00-1/23/12 You are my heart, my soul, and my best friend. You will be with me always.
Zeus 5/9/12-8/13/12 You taught me strength. Run free.
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