We propose to develop a novel MRI reporter gene system that uses MRI to monitor gene expression and the status of cell grafts in vivo. Current MRI technology is capable of high spatial resolution at 10- The proposed project seeks to evaluate the novel transgenic MRI reporter and its application as a marker for noninvasive monitoring of embryonic stem (ES) cell grafts. Thus, the development of ES cells can be monitored and traced.Public Health Relevance