Figure 1: Line graph showing result of impedence-based cell proliferation assay (Xcelligence). The cell index (see Section 2) was plotted against time for the 2BS cells. Pine pollen (PP) was added 24 h after cell-seeding, and an approx. 20% elevation compared with the control was observed between 24–48 h under PP (1 mg/mL and 2 mg/mL) incubation.