I would suggest the analogy that they mean as much to us as a single human sperm does to you.

In our experiment in artificial insemination, we must use a single sperm.

Once a single sperm has penetrated, the cell membrane of the egg changes its electrical characteristics.

The Arnoon dragon was simply a seed, one out of billions, and no more important to them than a single sperm cell is to humans.

A new technique in which a single sperm is injected into a single egg.

It involves injecting single sperm directly into an egg.

Sometimes a single sperm is injected directly into the egg.

Reproduction occurs when the male injects a single sperm at a time and can last up to half an hour.

It involves injecting a single sperm into the egg.