Previous Article Next Article Table of Contents Science, Vol.277, No.5328, 973-974, 1997 DOI10.1126/science.277.5328.973 Export Citation Expression Cloning in the Test-Tube King RW, Lustig KD, Stukenberg PT, Mcgarry TJ, Kirschner MW [Referenced By] Please enable JavaScript to view the comments powered by Disqus.