Formation of bundles of microfilaments during spreading of fibroblasts on the substrate.
D002448:Cell Adhesion; D002462:Cell Membrane / Q000648:ultrastructure; D002465:Cell Movement; D002478:Cells, Cultured / Q000502:physiology / Q000648:ultrastructure*; D004721:Endoplasmic Reticulum / Q000648:ultrastructure; D008247:Lysosomes / Q000648:ultrastructure; D008928:Mitochondria / Q000648:ultrastructure; D009940:Organoids / Q000648:ultrastructure