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:Eicosanoids derived from AA, including PGE2, TBX2, and LTB4, are more proinflammatory than those derived from DHA (Calder, 2006). The results of our study confirmed this pathway of eicosanoid formation. Chickens fed LR diets had significantly lower levels of PGE2 and TBX2 in the blood than those fed HR diets. These results are in agreement with those of Cherian et al. (2009), who showed that the level of incorporation of n-3 FA was higher, but that of AA in cardiac ventricle lipids was lower, and the levels of PGE2 and TBX2 in the blood of progeny (7-, 14-, 28- and 42-day-old chickens) were lower after feeding HR diets to broiler hens. Liu et al. (2014) reported significantly lower levels of pro-inflammatory eicosanoids (PGE2 and TBX2) in the plasma due to inhibition of phospholipase A2 activity in chickens fed diets rich in PUFA n-3 than in chickens fed diets rich in PUFA n-6.
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