TABLE 1.

Distribution of ¹³ C-labeled sphinganine and sphingosine in total pools of each sphingoid base

	[13C]sphinganine (%)a		[13C]sphingosine (%)a
Tissue	Mean	SE	Mean	SE
Skin epidermis (n = 5)	4.422	0.787	trace
Liver (n = 5)	4.113	0.397	1.051	0.153
Skeletal muscle (n = 4)	0.994	0.158	trace
Synapse membrane (n = 5)	0.292	0.048	trace

Replacement ratios by [¹³C]sphinganine and [¹³C]sphingosine in each tissue were calculated.

^aValues were corrected by the intensities of non-labeled sphinganine and sphingosine standard.