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[Warhammer 40k] Dark Eldar. Do they clone or do they breed.

In the book Renegade and the latest Codex it is mentioned that only Dark Eldar elite do carry to term.
The normal Dark Eldar are raised in "tubes". But are they cloned/ entirely artifcial. Or are they the product of sex and then just transfered to the "tubes".
gpt
They're entirely natural. Eldar can detect pregnancy at an extremely early stage, and when a female determines she is pregnant (or possibly that there have been sufficient inseminations to carry the foetus to term) she goes to the Homunculus, they remove the offspring and implant it in one of the gestation tubes, and she goes on her murderous way. 

Tube Born almost never know their parentage either, and their growth is accelerated past infancy into early childhood, before being turned out onto the streets.