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If ;you are unable to use xanthan gum, you could ;use guar gum, but some
people experience some GI symptoms from using it.  I dont think egg replacer
would do the job. You could try either methylcellulose (I think you can only
get large quantities thru a chefs catalog, but could possibly split this with
other people) or clear gel , which is available here in MI from a kitchen
speciality store, called Kitchen Glamour. Hope this helps.  Mary in MI