00298nam a2200121 a 450000500170000008200150001710000060003211000320003824500400007025000120011026000360012230000180015820251203091647.0  a572.8bMOL  d_  aWalker, J.M., Gingold, E.B.  aMolecular biology and biotechnology  a2nd ed.  aDelhibPanima Educationalc1993  axx,434p, 22cm