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:…corr-4a is a bisaminomethyl bithiazole compound that promotes maturation of Phe508 CFTR but shows little rescue of a mutant dopamine receptor 4 (Pedemonte et al., 2005), whereas the thiazole derivative corr-2b and the pyrazole derivative VRT-532 also promote maturation of Phe508 CFTR but show…
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