Comparison of the diversity of nifH genes in the guts of six termite species by FLT-RFLP analysis. Electropherograms of HhaI-digested nifH sequences amplified with a fluorescence-labeled primer are shown. Base lengths are indicated below the electropherograms. Electropherograms: A, R. speratus; B, C. formosanus; C, N. koshunensis; D, C. domesticus; E, G. fuscus; F, H. sjoestedti.