For those who are interested in advances in gene 'therapy' and its implications for 'gene doping', check out the recent publication in nature: nature news RNAi is technique used to 'interfere' with the normal expression of a particular gene. In effect it reduces the amount of transcription of that particular gene. This technique has been around for quite a while, but its use has largely been limited to 'simple' organisms. Its use in eukaryotic cells has generally been limited to in vitro cell cultures. This new work shows RNAi effectiveness in vivo. The implications are huge with regards to biological and clinical research. There are also huge implications for the world of gene doping.