Substitute for ground flaxseed in this recipe: http://eat-drink-love.com/2013/04/no-bake-energy-bites/
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I think you can probably just leave them out rather than subbing anything for them, but I would also reduce the agave syrup by half to begin with, then add a little more if the mixture is too crumbly.
I would either just add more chia or oats to keep the consistency.
Maybe wheat germ would work..?