A New Sensor to Detect Physiological Levels of Nitrate and Nitrite (image) Tohoku University Share Print E-Mail Caption sNOOOpy is shown in a human cancer line, HeLa cell. NO3- concentration increasing at intervals. Credit Takafumi Uchida (J. Biol. Chem, 2015) Usage Restrictions Credit: Takafumi Uchida (J. Biol. Chem, 2015) Share Print E-Mail 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.