In collaboration with German, French and US colleagues we co-published an article about minimal life forms, titled:
Acevedo-Rocha CG, Fang G, Schmidt M, Ussery DW, Danchin A. 2012. From essential to persistent genes: a functional approach to constructing synthetic life. Trends in Genetics. doi: 10.1016/j.tig.2012.11.001. [Epub ahead of print]