This may be due to the latter having two Bt toxins
inserted for Lepidoptera control (Cry1Ab 5-endotoxin and Vip3Aa20 vegetative insecticide protein), whereas the former has only the Cry1Ab for lepidopteran control.
American farmers are returning to highly lethal chemicals because of widespread overuse and failure of the genetically engineered Bt toxins
to control corn rootworm infestations, and glyphosate in controlling weeds.
Monsanto downplayed the findings, saying that Bt toxins
are "inoffensive and break down in the digestive tract.
US government agencies consider the Bt proteins produced by genetically modified (GM) crops to be the same as natural Bt toxins
Compared with typical insecticide sprays, the Bt toxins
produced by genetically engineered crops are much safer for people and the environment, explains study leader Yves Carriere, professor of entomology.
The study looked at the prevalence of Bt toxins
in female patients, finding that the chemicals -- which are often implanted into GMO crops including corn -- were found in the majority of those who were surveyed.
Completing this project will provide insights into the normal role for this protein and the mode of action of the BT toxins
Food companies should also respond urgently to new research showing that intact GM Bt toxins
have been detected in blood samples taken from women and umbilical cords in Canada.
Also, Bt toxins
require specific receptors to act which are absent in us.
They added that crops that are "pyramided" to incorporate two or more Bt toxins
are more effective at controlling insect resistance when they are used independently from crops that contain only one Bt toxin
The insect-killing Bt toxins
take their name from Bacillus thuringiensis, the bacterium that makes them.
In 1995, Adang demonstrated a method of designing a synthetic Bt gene suitable for expressing high concentrations of Bt toxins
in plants and was awarded a patent for his breakthrough invention.