A full-size, high-density RNA microchip (IMAGE) University of Vienna Caption A full-size, high-density RNA microchip is about the size of a fingernail and can contain up to 780 000 unique RNA sequences, each occupying a ~14 x 14 μm² area. The presence and the quality of the RNA can be verified via the addition of a complementary DNA strand with a green fluorescent tag. Credit C: Tadika Kekić Usage Restrictions Credit must be given to the creator. License CC BY 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.