Are structures known in Conway's Game of Life that clone themselves?

Question

Programming

In John Conway's Game of Life, structures are known that can spawn other elements, such as gliders producing Gosper's gun.
Are there known structures that can create their own clone, where can they be found?

Answer 1

Discovered in 2010, the structure is known as Gemini , replicating itself in 33,699,586 generations.