Fibroblasts (image) Stowers Institute for Medical Research Caption Top: Migrating fibroblasts reach out with veil-like protrusions known as lamellipodia. Bottom: Fibroblasts without a functional Arp2/3 complex are unable to form lamellipodia. Instead they form spiky edges known as filopodia. Actin is shown in red, ARP2 is in green, and DNA in blue. Credit Images: Courtesy of Dr. Praveen Suraneni Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.