Figure 2.

Oral Administration of Dopamine to P. barbatus Workers Significantly Raises Single Brain Dopamine Titers in a Dose- and Time-Dependent Fashion

Data shown on y axis are mean ± SEM of dopamine titers in picograms per single dissected P. barbatus brain. Dopamine titer was measured 1 and 3 days after oral administration of 0 mg/mL, 3 mg/mL, and 30 mg/mL dopamine in water solution. No. of single brains measured per group is 6–9. Dopamine titer was measured by mass spectrometry with a labeled internal dopamine standard (see Transparent Methods 1B–1D).