"This image was made by the use of a goat antisera, tagged with fluorescein, made against human IgG to detect human autoantibodies bound to the thyroid tissue. In this case, anti-thyroglobulin antibody is detected. The thyroid follicle colloid is stained positively."

1999 KUMC Pathology and the University of Kansas, used with permission; courtesy of Dr. James Fishback, Department of Pathology, University of Kansas Medical Center.