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:Genetic and molecular models explain trichome patterning by a transcriptional network of trichome promoting and repressing genes (Ishida et al., 2008; Pesch and Hülskamp, 2009; Balkunde et al., 2010).
Category: