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:…stimulates spindle pole targeting of p60 Because the con80 domain enhances microtubule binding by p60 and because localization of katanin at mitotic spindle poles requires intact microtubules (McNally and Thomas, 1998), we hypothesized that con80 might influence spindle pole targeting of p60.
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