Biomarker Spectrum (IMAGE) DOE/Pacific Northwest National Laboratory Caption Tests similar to this identify unique proteins in blood from women with breast cancer. In each of the four 25-dot squares, each dot represents one of 21 different proteins being measured in one blood sample. The color indicates how much of the protein is present. Credit Richard Zangar/PNNL Usage Restrictions Credit Zangar/PNNL 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.