TABLE 2.

m/z peaks observed with GXM from different strains of C. neoformans and proposed composition for the oligosaccharide represented by the peak^a

m/z valueb	Strain	Serotype	Proposed composition
397.4	B-3501	D	Man1GlcA1 + 1 acetyl
516.8	106.97	C	Man2GlcA1
516.9	24067	D
517.3	B-3501	D
517.2	I23	B
670.4*	B-3501	D	Man6GlcA2
679.1	24067	D	Man3GlcA1
679.1	H99	A
679.3	B-3501	D
679.3	I23	B
679.3	106.97	C
736.3*	24067	D	Man6GlcA2Xyl1
736.4*	B-3501	D
802.4*	B-3501	D	Man6GlcA2Xyl2
802.4*	24067	D
802.4*	I23	B
811.1	106.97	C	Man3GlcA1Xyl1
811.3	B-3501	D
811.3	24067	D
811.3	I23	B
841.1	24067	D	Man4GlcA1
841.4	B-3501	D
868.4*	I23	B	Man6GlcA2Xyl3
883.4*	B-3501	D	Man7GlcA2Xyl2
934.3*	I23	B	Man6GlcA2Xyl4
935.1*c	106.97	C
943.3	I23	B	Man3GlcA1Xyl2
973.4	24067	D	Man4GlcA1Xyl1
973.5	B-3501	D
1,001.4*	B-3501	D	Man9GlcA3
1,038.9	H99	A	Man4GlcA1Xyl1 + 1 acetyl + 1 Na+
1,067.9	B-3501	D	Man9GlcA3Xyl1
1,148.9	106.97	C	Man4GlcA2Xyl1
1,179.3	B-3501	D	Man5GlcA2
1,199.8	I23	B	Man5GlcA1Xyl1 + 1 acetyl + 1 Na+
1,199.9	106.97	C
1,201.3	B-3501	D	Man5GlcA2 + 1 Na+
1,341.4	B-3501	D	Man6GlcA2
1,473.4	B-3501	D	Man6GlcA2Xyl1
1,484.8	24067	D	Man5GlcA2Xyl2 + 1 acetyl
1,605.2	H99	A	Man6GlcA2Xyl2
1,605.3	I23	B
1,605.4	B-3501	D
1,636.1	24067	D	Man7GlcA2Xyl1
1,664.5	B-3501	D	Man8GlcA1Xyl1 + 1 acetyl
1,692.7	H99	A	Man6GlcA1Xyl4
1,944.3	106.97	C	Man7GlcA3Xyl2c

^aMass spectra were obtained in the negative mode in 50% MeOH/0.5% NH₄OH. Peaks from different strains representing the same oligosaccharide are listed below the first entry.

^b*, values for doubly charged ions.

^cTentative identification.