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Timeline of motor system development in Drosophila. Summary diagram showing sequence of electrical (Baines and Bate, 1998), morphological (Tripodi et al., 2008), and behavioral development (Crisp et al., 2008). Times are relative to tracheal filling (TF = 0). NT, neurotransmitter. Vertical bars indicate episodic activity in the motor system as revealed by muscle contractions.
