Is there any organism constituted by two cells only?

[WJames]

cogito at bo.netttuno.it (Sede Nazionale) wrote:
>For my own research in A.I. I'm interested about this possibility.
>If someone knows about, please answer 
>cogito at bo.nettuno.it
>
This is maybe stretching a point, but the prespore/mother cell pair in a 
sporulating Bacillus might be thought of as constituting a two cell 
organism.