@article{0070f3eb83be4116974cebba65c63d6c,
title = "The dihydrofolate reductase amplicons in different methotrexate-resistant Chinese hamster cell lines share at least a 273-kilobase core sequence, but the amplicons in some cell lines are much larger and are remarkably uniform in structure",
author = "Looney, {J. E.} and C. Ma and Leu, {T. H.} and Flintoff, {W. F.} and Troutman, {W. B.} and Hamlin, {J. L.}",
year = "1988",
doi = "10.1128/mcb.8.12.5268",
language = "English",
volume = "8",
pages = "5268--6279",
journal = "Molecular and Cellular Biology",
issn = "0270-7306",
publisher = "American Society for Microbiology",
number = "12",
}