1 The abbreviations used are: KDO, 3-Deoxy-D-manno-octulosonate; KDO 8-P, 3-DeoxyD-manno-octulosonate 8-phosphate; Tris, Tris-(hydroxymethyl)aminomethane; HEPES, N-[2Hydroxyethyl]piperazine-N’-[2-ethanesulfonic acid]; PNPase, purine nucleoside phosphorylase; EDTA, (ethylenedinitrilo)tetraacetic acid; 2D gel electrophoresis, two dimensional gel electrophoresis; SDS-PAGE, sodium dodecyl sulfate-p...