| http://www.w3.org/ns/prov#value | - ample to the purified lipid cell-wall component or the conjugate. [0063] The organic carrier may be a protein including bovine serum albumin (BSA), gelatin, keyhole limpets haemocyanin and the CD1 molecule, or may be a carbohydrate or may be a micelle. [0064] According to another aspect of the invention there is provided a purified lipid cell-wall component or analog or derivative thereof or a con
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