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Fig. 4. Serotonin application resulted in reversible enhancement of the optical
responses in both the macroglomerular complex (MGC) and the ordinary glomeruli
(Gs). The average peak percentage increase in the optical response in the MGC
was 48.7±8.7% (N=7) and in the Gs was 40.0±8.0%
(N=5). These both represent significant increases from the control
values (P<0.001 and P<0.005, respectively). The
enhancing effects reversed significantly with washing in both the MGC and Gs
(P<0.05). Scale bar, 200 µm. OL, optic lobe; Oe, oesophagus;
PC, protocerebrum; SOG, suboesophageal ganglion. Error bars represent
S.E.M.