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It has been shown that in orthopteran insects each of the optic lobes (OLs) contains a circadian pacemaker controlling locomotor activity and that the pars intercerebralis (PI) modifies the activity level. However, the present study showed Period protein-like immunoreactivity (PER-ir) in the PI and dorsolateral protocerebrum (DL) as well as in the OLs in the American cockroach, Periplaneta americana,...
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