00406nam a2200133Ia 4500008004100000082001400041100002100055245003300076260004400109300001500153490006000168600001900228650002500247140224s9999    xx            000 0 und d  a576.31 L7  aMaclean, Norman.  aThe differentiation of cells  aMarylandbUniversity Park Presscc 1977  aviii,216p.  aGenetics-Principles and Perspectives; a series of texts  aNorman Maclean  aCell differentiation