Breast Cancer Cells (IMAGE) Johns Hopkins Medicine Caption The images show a breast cancer cell making protrusions. These protrusions drive activity pulses of the protein ERK, causing the red biosensor to shuttle in and out of the nucleus of the cell. Credit Jr-Ming Yang and Chuan-Hsiang Huang 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.