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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
CLSM images of PPI (A,B) and MIX (C,D) samples. To discriminate the fluorescent protein layer around each air bubble, a comparison with soap bubbles with no protein content (E) has been carried out.