Lyssarrian

From Memory Alpha, the free Star Trek reference

The Lyssarrians are a species in the Alpha/Beta Quadrant who had attained interstellar travel prior to 2153. The lead government of the Lyssarrians is known as the Lyssarrian Prime Conclave.

On the Lyssarrian homeworld, there is a creature called a Lyssarrian desert larvae. When it is injected with genetic material from another species, it creates a mimetic simbiot, or a clone. The Lyssarrian Prime Conclave has deemed doing this illegal.

A rogue group who call themselves the Velandran Circle have been experimenting with an enzyme which would slow the aging process of such a genetic clone. As of 2153, it was still experimental. (ENT: "Similitude")