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:Since aIIbb3 integrins mediate the uptake of pFN into platelet a-granules (Ni et al.,
2003a), we performed Western-blotting with lysates from washed platelets and found that the FN content was significantly reduced to 70% in platelets from Fn1syn/syn mice (Figure 1F and Figure 1— figure supplement…
Category: