Circulating Tumor Cells (CTCs) In this demonstration of the CTC-Chip, circulating tumor cells (fluorescent labeled, shown in white) mixed with blood (not labeled) are captured on nano-scale posts as they flow through the chip. The chip is the size of a microscope slide with 78,000 posts, which are coated with antibodies to epithelial cell adhesion molecules in tumor cells. (Video courtesy of Dr. Sunitha Nagrath, Massachusetts General Hospital/Harvard Medical School) For Copyright Notice and Restrictions please visit our Web site at: