Before revision:  By exploring a wide range of realistic parameters we and that, when the energy profile for ET along the chain is relatively at , just a small coherent contribution can provide a robust and significant increase in ET rate (above the semi-classical diffusive-hopping rate), even at physiologically-relevant temperatures.
After revision:  By exploring a wide range of realistic parameters we and that, when the energy profile for ET along the chain is relatively flat , just a small coherent contribution can provide a robust and significant increase in ET rate (above the semi-classical diffusive-hopping rate), even at physiologically-relevant temperatures.