Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:Previous studies revealed that acylcarnitines were elevated early after APAP treatment and that their elevation was indicative of mitochondrial damage and dysfunction.(15,19) In the present study these observations were confirmed, as palmitoylcarnitine was elevated by toxic doses of APAP and maintained at normal levels (compared with untreated controls) by Wy-14,643 pretreatment.
Category: