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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 (http://creativecommons.org/licenses/by/4.0/).
Proliferation assays on PLA discs with different cell types. (A) without collagen; (B) PLA discs coated with rat tail collagen; (C) PLA discs coated with bovine collagen. Blue: HUVEC, red: NHDF, green: hOB and lilac: SaOS-2.