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:The Scottish translocation (St Clair et al., 1990) interrupting the coding sequence of DISC1 occurs between exons 8 and 9 (Ishizuka et al., 2006; Millar et al., 2001).
Category: