phenix rising

あまり聞き慣れないことばだ。

Relics of the retrovirus are scattered throughout our genome but have long since lost their infectivity due to mutation. By comparing 10 or so of these dysfunctional relics, Heidmann and his colleagues puzzled out the components of the original virus that must have infected our ancestors eons ago. Using DNA cloning techniques, they then reconstructed a version that can infect human cells. Heidmann says this virus, which he calls Phoenix, is completely harmless. But he thinks it could play a role in cancer research because high levels of similar retroviral particles have been found in many different types of tumors, leading oncologists to suspect that they may help cancers grow.