Figure 1: Confocal laser scanning microscopy of FISH after wood feeding. (A) The blue signal shows the autofluorescence in the termite gut. (B) The green signal shows the excitation of Eub 338 which was used as a probe for the detection of bacteria. (C) The red signal shows the excitation of Arc 915 which was used as a probe for the detection of archaea. (D) The overlap of A, B and C. M, Midgut wall; PM, peritrophic membrane; E, endoperitrophic space; Es, ectoperitrophic space.