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Key points
In newborn rats, L‐DOPA increases the occurrence of air‐stepping activity without affecting movement characteristics.
L‐DOPA administration increases the spinal content of dopamine in a dose‐dependent manner.
Injection of 5‐HTP increases the spinal serotonin content but does not trigger air‐stepping.
5‐HTP counteracts the pro‐locomotor action of L‐DOPA.
Less dopamine and serotonin are...