As of NUMBER@1 , no one has yet synthesized a `` protocell '' using basic components which would have the necessary properties of life -LRB- the so-called `` bottom-up-approach '' -RRB- .

As of NUMBER@2 , no one has yet synthesized a `` protocell '' using basic components which would have the necessary properties of life -LRB- the so-called `` bottom-up-approach '' -RRB- .
