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:…(Mongera et al., 2013), Tg(crestin:creERT2);Tg(-3.5ubi:loxP-GFP-loxP-mCherry) (Mosimann et al., 2011; Kaufman et al., 2016), tfap2amob;foxd3mos (Wang et al., 2011) and Tg(sox17:creERT2;cmlc2: DsRed) [created using the sox17 promoter from Mizoguchi et…
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