Methadone Exposure (mg/kg)

Experimental Group

Control

0.485

1.00

1.75

Number of Neurons

103.4 ± 12.9

81.3 ± 12.0

14.8 ± 6.8

10.6 ± 2.8

Number of Glial Cells

3.8 ± 0.0

3.8 ± 1.8

4.9 ± 1.3

7.0 ± 2.3