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Mushroom by-products obtained by solid substrate fermentation only. (A) and (B) are mushroom production wastes (stipes and mushrooms that do not comply with commercial standards in terms of caliber, shape or size: 5–20% of the production weight); (C) by-products (surplus production: ≤ 5%); (D) spent mushroom substrate (>20% of the production weight). The photos were graciously supplied by Voz da Natureza.
