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:…al.
(1994), Takamori et al. (2000), Bellocchio et al. (2000)
Telencephalon (cortex); presynaptic Adrenal medulla Olivan et al. (2011);
hypothalamus Herman et al. (2004); corticotroph cells Kocsis et al. (2010)
Not viable (die at
weaning) WallenMackenzie et al. (2010)
VGluT2/DNPI Aihara et…
Category: