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:The main distribution of 13-galactosidase-producing cells in tissues from the different lines is summarized in Table I in parallel with the evaluation of collagen VI expression products in control embryos at different locations (Marvulli et al., 1996).
Category: