Gene Silencing at Breast Cancer Cells (IMAGE) Center for Genomic Regulation Caption Immunofluorescent breast cancer cells used in this study. Green fluorescent shows the phosphorylated progesterone receptor at Serine 294 and red fluorescent signal shows the same progesterone receptor phosphorylated at serine 400. Credit Francois Le Dily (CRG) Usage Restrictions CC 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.