%0 Journal Article %T Ancient Origin of Glycosyl Hydrolase Family 9 Cellulase Genes %A Davison, Angus %A Blaxter, Mark %J Molecular Biology and Evolution %V 22 %N 5 %P 1273-1284 %@ 0737-4038 %D 2005-02-09 %I Oxford University Press %~ DeepDyve