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:These proteins show a high accumulation in response to water deWcit and ABA treatments in the cell walls of bean plants (Covarrubias et al. 1995; García-Gómez et al. 2000).
Category: