TABLE 2.

MALDI-TOF MS molecular ions and structures of LOS molecules^a

Strain	L type	Ion (m/z)b	Calculated Mr	LOS
6940	L1	2,588.56	2,589.25	Galα1→4Galβ1→4Glcβ1→4Hep1
				PEA→3Hep2
35E	L2	2,954.71	2,955.47	Galβ1→4GlcNAcβ1→3Galβ1→4Glcβ1→4Hep1c
				Glcα1→3Hep2
				↑
				Exocyclic (C-6 and/or C-7)PEA
1291	L7		—d	Galβ1→4GlcNAcβ1→3Galβ1→4Glcβ1→4Hep1
				PEA→3Hep2
8532V	L8v	2,465.51	2,466.21	Galβ1→4Glcβ1→4Hep1
				Glcα1→3Hep2

^aBased on MALDI-TOF MS, known structures, and genetic considerations.

^bMALDI-TOF MS was performed in the negative-ion mode; the observed m/z values are −(H).

^cA sialylated molecular ion (m/z 291.26) of this species is also present.

^dSee reference 22.