![]() ![]() Although the creepy crawler's size may make it look threatening, it is not aggressive and, like most spiders, will only attack when it feels threatened, experts say. The Brazilian wandering spider is large, with a body size reaching up to 2 inches (5 centimeters) and leg spans stretching 5 or 6 inches (13 to 15 cm). Researchers have since tested the toxin that is responsible for this unusual effect, called PnTx2-6, in the hope of developing a potential new drug for erectile dysfunction. The effect happens because the spider's venom raises the levels of nitric oxide, which is a chemical that increases blood flow. In 2007, researchers found that the bites of the Brazilian wandering spider can cause long and painful erections in human males, along with other symptoms. The Brazilian wandering spider's venom contains a toxin whose unusual erection-inducing qualities have attracted the attention of the pharmaceutical industry. Here are some of the weirdest effects spider bites have had on people. ![]()
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