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:Generation of macrophages from patient-derived iPSCs is of particular interest (Lachmann et al., 2014;Mucci et al., 2016), as these cells play an important role in tissue homeostasis and innate immunity (Ginhoux et al., 2016).
Category: