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:Furthermore, Ang II, the dominant effector peptide of the RAS, reduces the mRNA expression of osteocalcin (a protein specifically expressed during maturation of osteoblastic cells) and decreases the activity of alkaline phosphatase (a marker of osteoblastic differentiation) via its receptor AT1 (36).
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