AstroPath (IMAGE) Johns Hopkins Medicine Caption The AstroPath platform allows for the assessment of the level of expression of a given marker on individual cells, while maintaining information on their spatial location. Shown here is a melanoma tissue section. PD-L1 expression is shown in red and PD-1 in blue. The height of the peaks represent the levels of expression. Credit Seyoun Park, Ph.D. 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.