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:Second, HASM cells in culture, when observed between 3 and 6 h after plating, were not spindle shaped or aligned in parallel, as they are at the tissue level (5); instead, they were irregularly shaped (Fig.
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