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Fig. 5. The normalized and binned sensillar potential (SP) amplitude (A,C) and
action potential (AP) frequency (B,D) parameters over 185 min (1 bin=5 min)
for recordings from ZT 1-4 (A,B) and ZT 8-11 (C,D). Values are means + s.e.m.
(B,D) Under the influence of 8bcGMP (top recordings) a significant decrease of
the AP frequency can be recognized for both ZTs when compared to the
respective controls (bottom recordings) (Student's t-test for
independent samples, P<0.01) and when comparing the three
intervals within each time course (separated by dotted lines). Different lower
case letters denote significant differences between tested groups of means
(ANOVA and Tukey HSD post-hoc test; 
=0.01,
P<0.01). The means in the second (b) and third time interval (c)
are not significantly different (b,c) for both ZTs. The decrease of the action
potential frequency at ZT8-11 is 12% stronger than in recordings from ZT1-4.
(A,C) In contrast, the SP amplitude remained unchanged.
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