Microscope Images of the Engineered Cells (IMAGE) University of Southampton Caption The attached image shows microscope images of the engineered cells (nuclei in blue) with HIF-1 visualized (in red). In the left hand panel, cells are in hypoxia but no doxyxyclin is present, therefore HIF-1 remains active (red dots). In the right hand panel, the cells are grown in hypoxia and in the presence of doxyxyxlin, therefore the cyclic peptide inhibitor is produced and HIF-1 is inhibited, as demonstrated by the absence of the red dots. Credit University of Southampton 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.