Jv©v¶ ¢ (IMAGE) Institute of Science and Technology Austria Caption In plants such as snapdragons the stigma contains a toxin that stops pollen growth. Pollen in turn produces antidotes to all toxins except for the toxin produced by the 'self' stigma. Credit David Field Usage Restrictions None License Licensed 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.