FIG. 1.

Ester-linked and amide-linked hydroxy fatty acids in lipid extracts of subgingival plaque and gingival tissue samples. The characteristics and number of sites sampled are listed in Results. Lipids were extracted as described in Materials and Methods. The histogram bars depict the recovery of ester-linked and total hydroxy fatty acids in lipid extracts of subgingival plaque or gingival tissue samples. Subtracting the ester-linked fatty acid content from the total fatty acid content determines the recovery of amide-linked fatty acid. Error bars represent the standard errors of the means.