Table 1.

Residual morphine content in post-mortem tissues after 4 h of injections of 5 mg/kg morphine.

Residual morphine (μg) (±SEM)
Tissue	8 week	24 week	p value	8 week	24 week	p value
	per tissue weight(g)	per tissue weight(g)		per protein content(g)	per protein content(g)
Serum	4.47±1.72	23.32±1.61	>0.05	0.49±0.12	3.39±0.34	<0.0001
Spleen	22.45±2.93	68.41±7.05	<0.001	0.89±0.14	4.63±0.35	<0.0001
Kidney	58.66±5.65	56.14±5.95	>0.05	2.42±0.53	4.23±0.15	<0.05
Liver	40.12±6.46	44.52±1.01	>0.05	3.25±0.37	2.81±0.71	>0.05
Heart	1.62±0.31	20.49±2.31	<0.0001	0.43±0.31	1.20±0.62	>0.05
Lungs	17.38±3.61	63.22±14.8	<0.001	0.96±0.32	2.28±0.54	>0.05
Brain	1.21±0.49	7.47±0.82	<0.05	0.25±0.11	0.41±0.18	>0.05