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:…3 de Lamirande and Gagnon (2002) PD98059 prevents MEK activation by Raf 4–50 50 de Lamirande and Gagnon (2002) U126 inhibits activated MEK 0.058–0.072 0.3 de Lamirande and Gagnon (2002)
PI3K Wortmannin catalytic subunit 0.005 0.01 Fisher et al. (1998); Nauc et al. (2004) Akt Akt inhibitor…
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