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Cell interactions with recombinant spider silk. a Human fibroblasts grown in vitro for 3 days on 4RepCT fibres, stained for F-actin (green) and DNA (red). b Histological section stained with haematoxylin and eosin of a 4RepCT fibre bundle after 1 week of subcutaneous implantation in rat. The fibres are infiltrated by elongated cells (asterisk), likely fibroblasts and angioblasts. Arrows indicate the presence of newly formed capillaries in the implant
