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:In agreement with findings showing that PLCb1 is mostly located at presynaptic sites (Fukaya et al., 2008) and with its apparent absence from the PSD-95 complex (Dosemeci et al.
Category: