By Megan Molteni April 22, 2021 Reprints Confocal micrograph of a primary human fibroblast cells grown in culture stained for actin, a highly abundant protein in cells that makes up the cytoskeleton of cells (blue). The nucleus is shown in red. Fibroblasts are specialized cells involved in wound healing. MATTHEW DANIELS / UNIVERSITY OF OXFORD/WELLCOME...