TY - RPRT TI - Phenotypic expression in E. coli of a DNA sequence coding for mouse dihydrofolate reductase. AU - A C Chang AU - J H Nunberg AU - R J Kaufman AU - H A Erlich AU - R T Schimke AU - S N Cohen PY - 1978 DO - 10.1038/275617a0 UR - https://pubmed.ncbi.nlm.nih.gov/360074/ ID - 360074 ER -