NO ANTIBIOTIC MARKER GENES PLEASE. “There is a lack of data on the real rates of HGT between transgenic plants and microbes, and hence prestigious groups around the world, such as WHO, FAO, and the NAS, are urging researchers to produce transgenic plants without antibiotic resistance markers.” A wise precautionary principle given what we know about horizontal gene transfer (HGT).
http://www.isb.vt.edu/articles/oct0501.htm