<Journal class="Journal" value="Proceedings of the National Academy of Sciences of the United States of America" /> <Page class="#txt" value="7464"> <Page-2 class="#txt" value="8" /> </Page> <Volume class="#txt" value="94" /> <Year class="Year" value="1997" /> </Reference> <Author class="Author" value="Newcomb RD" /> <Author class="Author" value="Campbell PM" /> <Author class="Author" value="Ollis DL" /> <Author class="Author" value="Cheah E" /> <Author class="Author" value="Russell RJ" /> <Author class="Author" value="Oakeshott JG" /> <Medline class="Medline" value="9207114" /> <Mutation class="Mutation" value="G137D_luccu-E3aest7" /> <Abstract class="LongText" value="Newcomb_1997_Proc.Natl.Acad.Sci.U.S.A_94