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A selected air-dried fragment of Aplysina archeri sponge skeleton is rigid and represents the typical tube-like morphology of verongiids (A). Decellularization with subsequent demineralization of this construct [6,26] leads to isolation of the flexible chitinous scaffold (B–D), which reproduces the shape, form, and structural features of the original tubular sponge skeleton, with a length of up to 1.5 m.
