Assertion: spheroid's cell | /r/HasProperty | aggregated into spheroid
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Source sentences:
text: (A) Infection of PHH with recombinant adenovirus expressing GFP and luciferase (AdGL) was most effective if performed upon seeding (red columns; d 0) rather than when cells had aggregated into spheroids (blue columns; d 4), presumably due to the compactness of the spheroid at day 4 which hampers efficient penetration of the virus.