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:Indeed, no CYCD6-like plant protein identified so far has the LxCxE motif, indicating that sequence divergence within this motif is a specific and group-identifying feature of D-type cyclins (Menges et al. 2007).
Category: