
The use of radioactive tracers in cell research is an effective and safe means of monitoring molecular interactions. There is simply no other technique which allows the precision and specificity of radioactive tracers.

The use of radioactive tracers in cell research is an effective and safe means of monitoring molecular interactions. There is simply no other technique which allows the precision and specificity of radioactive tracers.
Introduction
The possibility of human cloning, raised when Scottish scientists at Roslin Institute created the much-celebrated sheep "Dolly" (Nature 385, 810-13, 1997), aroused worldwide