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In the new Canadian film The Baby Formula, opening later this week, two lesbians become pregnant using sperm derived from each other's stem cells.

The premise of the mockumentary may be fictional, but with the speed at which stem cell research is evolving, could same-sex human reproduction one day become reality? And should it?

Scientists have already taken the first baby steps toward realizing this brave new, and some would say controversial, world of conception.

Stem cells are like the body's blueprint, giving rise to all the different cells that make up an organism, from the skin and organs to the brain, bone and blood. Harnessing them as factories to produce specialized cells to repair or regrow tissues is the great hope of regenerative medicine.

In 2006, Karim Nayernia of Newcastle University generated sperm from male embryonic stem cells that fertilized female mice and produced offspring. A year later, his team was able to derive primitive sperm from stem cells taken from the bone marrow of human men.

Since then, Dr. Nayernia's group has been working on creating sperm from...