@Lou, you're quite welcome! I'm just paying it forward, from those who helped me with my gut issues. @Hip, again, very good questions. I'm afraid I don't know the answer. You might want to ask Grace/Dr. BG on her blog or Tim Steele (aka "Tatertot") over at freetheanimal.com (just pose a question in the bottom of any RS post, such as this one). If either of them don't know, I'm sure someone who's been researching these finer details of RS and those species will get back to you.