TY - RPRT TI - pSAR1, a natural plasmid from Streptomyces arenae, shows rapid increase and decrease of copy numbers on changes of growth media. AU - M Braxenthaler AU - B Poetsch AU - K U Fröhlich AU - D Mecke PY - 1991 DO - 10.1016/0378-1097(91)90494-u UR - https://pubmed.ncbi.nlm.nih.gov/1769539/ ID - 1769539 ER -