MDSC (image) Helmholtz Zentrum München - German Research Center for Environmental Health Share Print E-Mail Caption Staining of surface molecules (CD11 in red, CD33 in green) on cells in lung tissue, nuclei in blue. MDSC are positive for both surface markers and consequently appear orange (arrow). Credit Source: Helmholtz Zentrum München Usage Restrictions None 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.