TY - RPRT TI - Replicating SV40 molecules containing closed circular template DNA strands. AU - R Jaenisch AU - A Mayer AU - A Levine PY - 1971 DO - 10.1038/newbio233072a0 UR - https://pubmed.ncbi.nlm.nih.gov/4330296/ ID - 4330296 ER -