Margaret wrote: Catharine, I think tetracycline is an antibiotic sometimes prescribed for humans. Over exposure to it may result in its no longer being effective against bacterial infection, and super strains of bacteria may result. I think, at least, that's one of the objections. Another is that some people are violently allergic to it. Your post touched on most of the concerns this technology has caused without characterizing the terminology as vicious and cruel. I would have so characterized it. I know tetracycline is an antibiotic; it's one of the few to which I am not allergic. My curiosity was with the assumed detrimental effects of exposure to tetracycline residue in *seeds*. The amount of tetracycline would be very small (I assume...and that may be where I am off-base), and I am wondering how people can be worried about that level of exposure and NOT worried about exposure from eating animal products (milk, meat, eggs, etc.) derived from animals who have been routinely pumped full of antibiotics from birth. I agree with Lucinda's call for a chemist who can help sort this out. I am ignorant. Catharine