One replication of the experiment successfully linked a rat at Duke with one at the University of Natal in Brazil.

BBC: One rat brain 'talks' to another using electronic link

Before the structure of DNA was unscrambled no-one had a clear idea how genetic replication - one of the cornerstones of life - worked.

BBC: Francis Crick memorial at University of Cambridge

Some authors further distinguish between propagation (local replication) and migration (getting from one system to another).

CNN: Technology - Analysis: Understanding viruses