Table 3.

Altered glutamine and glutathione precursors in plasma of SCD patients compared with healthy volunteers

GSH precursors (μM)	Plasma
	Controls	SCD	P
Glutamate	9 ± 2	18 ± 2	.006*
Cysteine	238 ± 15	267 ± 16	.4
Glycine	32 ± 4	53 ± 4	.01
Glutamine	708 ± 60	825 ± 55	.3

Data are shown as average plus or minus SEM.

^*Unpaired t test performed with Welch correction for unequal variance.