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As shown by the fluorescent marker gene it carried, the drive spread at different rates across the mice’s body regions, with the variation being most pronounced in the brain: In the cortex, the marker propagated to 25% of the viruses, whereas it ended up in as much as 90% of the viruses in the brain stem.

Oxitec scientists also inserted a fluorescent marker gene into the modified bugs.

The other is a fluorescent marker gene.

She targeted a few cells present when the embryonic skin is a single layer thick, and added a marker gene that made them glow red.

Neither the layer hens nor the eggs sold for consumption would contain modified genes, because only males carry the inserted marker gene, he notes.