New vaccines for diseases as aids and cancer are being developed through the use of cell and tissue cultures a new era in the development of pharmaceutical products comes forth as a result of the advent of genetic engineering, the manipulation of the double helix, the spiral dna chain of life. (药物产品发展的新时代到来由于基因工 生命DNA链的双螺旋操作的出现。• New vaccines for diseases as AIDS and cancer are being developed through the use of cell and tissue cultures. • A new era in the development of pharmaceutical products comes forth as a result of the advent of genetic engineering, the manipulation of the double helix, the spiral DNA chain of life. （药物产品发展的新时代到来由于基因工 程，生命DNA链的双螺旋操作的出现。）