@article{https://resolver.caltech.edu/CaltechAUTHORS:20150205-094225275,
    title = "Directed Mutagenesis of Dihydrofolate Reductase",
    journal = "Science",
    url = "https://resolver.caltech.edu/CaltechAUTHORS:20150205-094225275",
    id = "record",
    issn = "0036-8075",
    doi = "10.1126/science.6356360",
    volume = "222"
}