Squamous cancer cell (IMAGE) University of California - San Diego Caption In this false-colored scanning electron micrograph, an oral squamous cancer cell (white) is attacked by two cytotoxic T cells (red), part of a natural immune response. Credit National Cancer Institute 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.