1. Analysis of mutation at the Chinese hamster aprt locus;Adair,1987
2. Alterations of the hprt gene in human 6-thioguanine resistant T-lymphocytes arising in vivo;Albertini;Nature (London),1985
3. The L5178Y/TK gene mutation assay system;Amacher,1984
4. On the complexity of mutagenic events at the mouse lymphoma tk locus;Applegate,1987
5. Sequence analysis of spontaneous mutations in a shuttle vector gene integrated into mammalian chromosomal DNA;Ashman,1987