The complex retroviral enzymes in the spider's venom that were transferred at the time of the bite triggered a profound and significant change in the genetic expression of Peter Parker's entire body. The retrovirus contained the codes for certain spider traits that were inserted into Peter's DNA. It transformed the way his body systems work, including his glands, nerves, and muscles. Spider-Man possesses superhuman strength, reflexes, and equilibrium; the ability to stick with great tenacity to most surfaces via microscopic claws located on his hands and feet; a subconscious premonitional danger sense; and an ability to project an organic webbing in a manner similar to that of spiders.