Oral Epithelial Cells (IMAGE) University of California - San Diego Caption Representative immunofluorescence images showing normal oral epithelial cells (left) and early stages of oral cancer (right, showing blue cells invading the stroma) just 20 days after activation of the YAP protein in combination with HPV oncogenes (right). Macrophages (pink cells) are more prominent in cancer, and reprogrammed immune cells that facilitate immune evasion and tumor invasion accumulate during cancer initiation. Credit UC San Diego Health Sciences Usage Restrictions use photo credit License Original content 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.