From Popular Science:

In a nondescript basement lab, jeans-clad engineers clutch blueprints, scrape stepladders across the unfinished floor and chat about the Cardinals as they tighten bolts on a new prototype device. At first glance, it could be any machine shop in the country.

But then you notice the wispy strands of soybean seedlings curling to life, their root tendrils bunched into test tubes lightly packed with soil, and you remember — this place is all about seeds.

Monsanto Co. produces 90 percent of the world’s transgenic crops, using a complex marriage between ancient techniques — cross-breeding different plants to produce a desired trait — and the most modern technologies available, from genomic research to NASA-caliber mechanical engineering.

How To Genetically Modify a Seed, Step By Step