TY - RPRT TI - Two-step transcriptional amplification as a method for imaging reporter gene expression using weak promoters. AU - M Iyer AU - L Wu AU - M Carey AU - Y Wang AU - A Smallwood AU - S S Gambhir PY - 2001 DO - 10.1073/pnas.251551098 UR - https://pubmed.ncbi.nlm.nih.gov/11734653/ ID - 11734653 ER -