2,4-D is an abbreviation for 2,4-Dichlorophenoxyacetic acid. Dow's 2,4-D technology inserts incorporates a gene from Sphingobium herbicidovorans, a soil bacteria that is tolerant to the 2,4-D herbicide. Dow has noted that a switch to HT plants that are resistant to 2,4-D poses a solution to growing weed resistance to the herbicide glysophate (trademark name RoundUp). In addressing concerns that 2,4-D residues may have negative health effects in humans, Dow's spokesman Garry Hamlin notes that 2,4-D "has been used safely in the U.S. for six decades and has evoked little concern among regulatory agencies about adverse health effects. ... Pesticide residues would be below levels required by the U.S. Environmental Protection Agency (EPA)."