(IMAGE) INSERM (Institut national de la santé et de la recherche médicale) Caption This is a human islet of Langerhans (0.3 mm diameter) with alpha cells stained red and beta cells stained green. Credit © Inserm Valery Gmyr 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.