00258nam a22001097a 4500003000400000008004100004082001600045100001500061245003600076260002800112300000800140OSt231219b        |||||||| |||| 00| 0 eng d  a575.1bO31P  aOld, R. W.  aPrinciples of gene manipulation  aOxfordbBlackwellc1981  a214