The locomotion of leukocytes is powered by membrane extensions called lamellipodia. Slower moving cells, such as fibroblasts, extend fingerlike membrane protrusions called filopodia. The leading edge of the cell membrane adheres to the extracellular matrix through transmembrane adhesion receptors termed integrins -Cadherins (choice A) are cell-cell adhesion molecules. -Fibrillins (choice B) are structural molecules that interact with elastic fibrils. -Laminins (choice D) are basement membrane glycoproteins. Diagnosis: Wound healing