Cell adhesion to the surface of samples was also evaluated by seeding L929 cells onto copolymer films for 24 h. Figure shows the SEM images of fixed cells on the copolymer's surface. On all of the tested materials, the morphology of L929 fibroblast cells was normal, with a mix of elongated bipolar and multipolar cells, indicating robust attachment. Additionally, the SEM micrographs clearly show cells in the process of division, indicating that they are viable and capable of growth. While some studies have suggested that the hydrophobicity of PBS might be a barrier to cell attachment, motivating studies into different surface treatments such as plasma treatment, to increase the hydrophilicity and facilitate the cell attachment , this was not the case for PBS-DLS copolymers. In fact, these results are in good agreement with our prior work indicating favorable adsorption of provisional matrix proteins (fibrinogen and fibronectin) on PBS-DLS copolymers . These proteins, which are also present in serum in the cell culture media, are responsible for mediating the cell adhesion.