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Fig. 3. Fictive crawling is not inhibited by bath application of 50 µmol
l1 DA. The fictive crawling motor rhythm is characterized by
alternating bursts of action potentials in the dorsal longitudinal muscle
excitor DE-3 (the largest unit in the DP nerve) and the circular muscle
contractor CV in ganglion 9, with a cycle period of 720 s
(Eisenhart et al., 2000). (A)
Spontaneous fictive crawling activity after a 10 min bath application of 50
µmol l1 DA. (B) Spontaneous fictive crawling activity in
saline without the amine.