Table 1.

Monosaccharide Composition of Murine IgA Determined by Gas-Liquid Chromatography

Sugar	HIGA mice	gddY mice
Mannose	0.485	0.204
GlcNAc	0.274	0.141
GalNAc	ND	ND
Galactose	0.302	0.148
SA	0.257	0.135
IS	1.000	1.000

Data are expressed as the average of two experiments relative to standard sugars and normalized to the IS, based on the area under the peak in the chromatograms. Ten micrograms of IgA was used per sample.

GlcNAc, N-acetylglucosamine; GalNAc, N-acetylgalactosamine; IS, internal standard; ND, not detected; SA, sialic acid.