00330    a2200121   4500020001500000082001500015100002000030245005600050260004800106300002100154650001800175700001500193  a019963677x  a660.6bTOR  aTorres, Raul M.  aLaboratory protocols for conditional gene targeting  aOxfordbOxford University Pressc1997g1997  axiii,167p.c23cm  aBiotechnology  aKuhn, Ralf