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Eucalyptus sawdust micromorphology with untreated intact fibers (a); mostly intact fibers and some bound macrofibrils (b); partially bound macrofibrils (c); exposed long macrofibrils and clusters (d); fused macrofibrils (e); and abundantly exposed macrofibrils under optimized conditions (f). Bound microfibril are marked by arrowheads, microfibril clusters are marked by circles, exposed microfibril are marked by arrows, and fused macrofibrils are marked by a box.
