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(A) Collagen gels were polymerized in silicone elastomer molds that were pressed onto glass slides. (B) Stained gels were embedded in PMMA resin and sectioned. (C) A typical FIB-SEM excavation site with the milled fiducial marker identified by a dashed box. (D) Representative SEM image from an ion beam milled face, with collagen fibrils shown in white.
