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. 2017 Mar 13;7:44490. doi: 10.1038/srep44490

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Yellow arrows indicate the dorsal trunks in the cephalothorax of mosquito pupae at the contraction (a) and expansion phase (b). Cross-sectional line AA′, from which variations in the inner diameters and frequency profiles of the two dorsal trunks are extracted. (c) Normalized intensity variation shows the respiratory motion of the dorsal trunks of Ae. togoi pupae. Peristaltic frequency variations in the dorsal trunks and the peak frequencies of An. sinensis (d) and Ae. togoi (f) pupae. Yellow arrows indicate the moving directions of the dorsal trunks. Red arrows denote the inner diameter of the dorsal trunks. Scale bar indicates 0.1 mm.