Figure 2. Chemotaxis of peripheral blood mononuclear cells from Alzheimer’s caregivers to 25 pg/ml () and 100 pg/ml () SDF-1 or noncaregivers to 25 pg/ml (•) and 100 pg/ml () SDF-1. Data are presented as cells migrating to SDF-1 divided by random migration of cells to media ± SEM. Blood was drawn at baseline and following the speech tasks. There was a differential change across the session with a significant group x time interaction (F (1,24) = 4.2, p = .05).