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Honestly I haven't tried substituting things on the fly for eggs - It looks like your initial thought got cut off so I'm not sure what ingredient you originally were asking about but this post has 6 possible substitutions and a really helpful comment thread about them. http://www.sheknows.com...
I hope that helps!
Dishing with Esther Choi of Mokbar.
Korean Summer Noodles
A Magical Sponge
What's Topping Lists
Sheet Pan S'mores
Grow an Entire Pizza